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Endocrine Disorders
By: Robera D. (BSc, MSc)
Department of Nursing
School of Nursing and Midwifery
Institute of Health Sciences
Wallaga University
Review of Anatomy
and Physiology
3
Learning objectives
Upon completion of this lesson, students will be able
to:
Identify major endocrine glands, their anatomic
location, and hormones they secrete
Summarize major action of hormones secreted from
each gland
Name disorders produced by over- and under-secretion
of hormones
4
Review of anatomy and physiology
Endocrine system (ES) is involved in regulating
metabolism, tissue function, reproduction, growth, and
development
Endocrine glands: pituitary, thyroid, parathyroids,
adrenals, pancreatic islets, ovaries, and testes
─They secrete their hormones into blood
Hormones: chemical messengers with specific target
tissue, where it impacts cells’ functions and reactions 5
Review of anatomy and physiology…
Hypothalamus is the link between NS and ES
─It controls pituitary
Hormone concentration in blood is maintained at a
relatively constant level according to need by negative
feedback mechanism
6
7
Figure 1: Hypothalamic and pituitary hormones and their target organs
Glands of the Endocrine System
8
Pituitary gland
Located on the inferior aspect of the brain
Secretes hormones that control secretion of hormones
by other endocrine glands
GHRH, GnRH, TRH, CRH, oxytocin and
vasopressin
─produced and released by hypothalamus
─act on cells of the pituitary gland
9
Pituitary gland…
Anterior pituitary gland
1. Follicle-stimulating
hormone (FSH)
2. Luteinizing hormone (LH)
3. Adrenocorticotropic
hormone (ACTH)
4. Thyroid-stimulating
hormone (TSH)
5. Prolactin (PRL)
6. Growth hormone (GH)
Posterior pituitary
gland
1. Vasopressin (or
ADH)
2. Oxytocin
10
Thyroid gland
Butterfly-shaped organ located in lower neck, anterior
to trachea
Blood flow to the thyroid is very high (about 5 mL/min
per gram of thyroid tissue)
3 hormones:
1. Thyroxine (T4): controls cellular metabolic activity
2. Triiodothyronine (T3): controls cellular metabolic
activity
3. Calcitonin: reduces plasma level of calcium
11
Parathyroid Glands
12
Situated in the neck and
embedded in the posterior aspect
of the thyroid gland
Parathyroid hormone
─Lowers phosphorus and rises
calcium in blood
Adrenal Glands
13
There are two adrenal glands, one attached to the
upper portion of each kidney
ACTH stimulates adrenal cortex to secrete adrenal
hormones
Adrenal hormones: glucocorticoids,
mineralocorticoids, sex hormones
Adrenal medulla secretes catecholamines
Glucocorticoids (e.g. Cortisol)
Influence on glucose metabolism (↑BG) : Increased
cortisol secretion results in elevated blood glucose
Inhibit inflammatory response (powerful immune
suppressant)
14
Mineralocorticoids (e.g. Aldosterone)
Involved in electrolyte metabolism
Act principally on renal tubules and GI epithelium to
cause increased Na+ absorption in exchange for
excretion of K+ or H+
Aldosterone is the primary mineralocorticoid
It is primarily secreted in response to presence of
angiotensin II
15
Adrenal Sex Hormones
Androgens
─exert effects similar to those of male sex hormones
Female sex hormones
─Adrenal gland may also secrete small amounts of
some estrogens
16
Pancreatic Islets
Pancreas lies transversely in the upper
abdomen
Beta cells of pancreas secrete insulin,
Insulin facilitates glucose transport into cells
alpha cells of pancreatic islets secrete
glucagon when blood glucose level is low
Glucagon promotes gluconeogenesis to raise
glucose level
Delta cells secrete somatostatin
17
Assessment
Health history
Ask if they have experienced changes:
Energy level
Tolerance to heat or cold
Weight
Thirst
Frequency of urination
Bowel function
Fat and fluid distribution
Secondary sexual characteristics (e.g., loss or growth of hair)
Any enlargement of thyroid gland
18
Assessment…
Physical examination
Vital signs
Head-to-toe inspection
Palpation of skin, hair, and thyroid
Abnormal findings
─Facial hair in women, buffalo hump, vision changes,
thinning of the skin, obesity of the trunk
19
Inspect the neck for thyroid gland
Tilt patient’s head
slightly back
Using lighting directed
downward from the tip of
the patient’s chin, inspect
region below cricoid
cartilage to identify
contours of the gland
20
21
Observe patient swallowing
Ask the patient to sip some water and to extend the neck
again and swallow.
Watch for upward movement of thyroid gland, noting its
contour and symmetry
Thyroid cartilage, cricoid cartilage, and thyroid gland all rise
with swallowing and then fall to their resting positions
With swallowing, lower border of this large gland rises and
looks less symmetric
22
Palpate thyroid gland
With the patient seating or standing
Stand behind the patient, ask the patient to flex the neck
slightly forward
Gently place fingers of both hands on patient’s neck so
that your index fingers are just below cricoid cartilage
Ask the patient to sip and swallow
Feel for the thyroid isthmus rising up under your finger
pads
23
Palpate thyroid gland…
Normal
─small, smooth, firm, nontender, free of nodules
Abnormal:
─soft in Graves disease
─firm in Hashimoto thyroiditis and malignancy
─tender in thyroiditis
24
Click here to see video
25
Diabetes
26
Learning objectives
At the end of this lesson, students will be able to:
Differentiate between type 1 and type 2 diabetes
Describe etiologic factors associated with diabetes
Explain diagnostic procedures of diabetes
Describe management strategies for diabetes
Differentiate between diabetic ketoacidosis and
hyperosmolar nonketotic syndrome
27
Definition
Diabetes is a group of metabolic diseases characterized
by hyperglycemia resulting from defects in insulin
secretion, insulin action, or both
It is a chronic illness that requires medical care and
patient self-management
Has physical, social, & economic consequences
28
Normal and abnormal blood glucose levels
29
2 hr post-load
glucose
FPG
0
7
0
-
-
10
0
12
6
-
Diabetes
Prediabete
s(IFG)
Normal
Hypoglycemi
a
-
14
0
20
0
-
Hypoglycemi
a
Normal
Diabetes
Prediabete
s (IGT)
RBS
Hypoglycemi
a
Normal
Diabetes
Risk Factors
Family history (e.g., parents or siblings with diabetes
Obesity
Age >30 years for type 2 and <30 years for type 1
Previously identified impaired fasting glucose or
impaired glucose tolerance
Hypertension
High-density lipoprotein (HDL) cholesterol ≤35 mg/dL
and/or triglyceride level ≥250 mg/dL
History of gestational diabetes or delivery of a baby
over 9 lb
30
Classification
1. Type 1 diabetes (5 – 10% of all diabetes)
2. Type 2 diabetes (90 – 95% of all diabetes)
3. Gestational diabetes
4. Latent autoimmune diabetes of adult (LADA)
5. Diabetes associated with other conditions or
syndromes
31
Pathophysiology
Insulin controls blood glucose levels by regulating the
production, use, and storage of glucose.
In patients with diabetes, cells may respond
inadequately to insulin or the pancreas may decrease
insulin secretion or stop insulin production completely.
When person eats a meal, insulin secretion increases
and moves glucose from the blood into muscle, liver,
and fat cells. (in healthy person)
32
Pathophysiology…
During fasting periods, the pancreas continuously
releases a small amount of “basal” insulin
33
Pathophysiology…
If the blood sugar becomes too low, glucagon is
secreted
Glucagon stimulates liver to release stored glucose,
thereby increasing the blood sugar.
They work together to maintain a constant level of
glucose in the blood.
Liver assists with glucose control (glycogenolysis &
gluconeogenesis)
34
Pathophysiology…
Once inside the cells, insulin functions in the following ways:
─Transports and metabolizes glucose for energy
─Stimulates storage of glucose in the liver and muscle cells
─Signals liver cells to stop the release of glucose
─Enhances storage of dietary fat in adipose tissue
─Accelerates transport of amino acids into cells
─Facilitates the transport of potassium into the cells
─Inhibits the breakdown of stored glucose, protein, and fat
35
Type 1 Diabetes
It is often characterized by acute onset and most commonly
affects children and young adults, although it can occur at
any age
It is characterized by destruction of pancreatic beta cells
It develops as a result of autoimmunity against beta cells
It is believed that autoimmunity destruction is initiated by a
combination of genetic, immunologic, and environmental
factors
36
Type 1 Diabetes…
Although events are not fully understood, it is generally
accepted that genetic susceptibility is a common
underlying factor in the development of type 1 diabetes.
People do not inherit type 1 diabetes itself but rather a
genetic predisposition, or tendency, toward the
development of type 1 diabetes.
This genetic tendency has been found in people with
certain human leukocyte antigen types
37
Type 1 diabetes cont’d
Beta cell destruction
Decreased insulin production
Increased glucose production by the liver,
and fasting hyperglycaemia
Glucose from food cannot
be stored in the liver but instead
remains in the bloodstream and
contributes to postprandial
hyperglycemia
38
Type 1 diabetes…
If concentration of glucose in blood exceeds renal
threshold for glucose, kidneys may not reabsorb all of
filtered glucose; glycosuria occurs
As glucose is excreted in urine, water follows it
(osmotic diuresis)
Fat breakdown results in increased production of ketone
bodies (ketoacidosis)
39
Type 1 diabetes…
Increased blood
glucose level pulls
cellular water into
blood → cellular
dehydration→
polydipsia
Deficiency of insulin
Glucose will not be conveyed from
extracellular to intracellular
compartment
Cells become energy depleted
fat & protein will be
drawn from adipose
tissue & muscle & and
ketosis
↑sed appetite
(polyphagia)
40
Type 2 Diabetes
It occurs more commonly in who are >30yrs and obese
Characterized by insulin resistance, impaired insulin
secretion, and increased hepatic glucose production
Insulin resistance refers to ↓sed tissue sensitivity to insulin.
Exact mechanisms of insulin resistance and impaired
insulin secretion are unknown
Although increasing age, obesity, and lack of physical
exercise as well as genetic factors are thought to play a role
41
Type 2 diabetes…
Type 2 DM has a strong genetic component
 In early stages of type 2 diabetes, glucose tolerance
remains near-normal, despite insulin resistance, because
beta cells compensate by increasing insulin output
As insulin resistance and compensatory
hyperinsulinemia progress, pancreatic islets are unable
to sustain the hyperinsulinemic state
IGT then develops
42
Type 2 diabetes…
Further decline in insulin secretion and increase in
hepatic glucose production lead to overt diabetes
Glucagon is relatively overproduced and secreted,
further augmenting hepatic glucose production
There is enough insulin present to prevent the
breakdown of fat
Note: Impaired insulin secretion contribute to the pathogenesis of type 2 DM
43
44
Gestational Diabetes (GD)
Glucose intolerance developing
during 2nd or 3rd trimester of
pregnancy
Hyperglycemia develops during
pregnancy because of secretion
of placental hormones, which
causes insulin resistance
45
Gestational diabetes cont’d
Most women with GD revert to normal glucose
tolerance postpartum but have a substantial risk (35–
60%) of developing diabetes in the next 10–20 yrs
Women with a history of GD should
─undergo lifelong screening for the development of
diabetes or prediabetes at least every 3 years.
─be counselled to maintain her ideal body weight and
to exercise regularly
46
Latent Autoimmune Diabetes of Adults
(LADA)
LADA is a subtype of diabetes in which the progression
of autoimmune beta cell destruction in the pancreas is
slower than in types 1 and 2 diabetes
Patients with LADA are not insulin-dependent in the
initial 6 months of disease onset.
Clinical manifestation of LADA shares the features of
types 1 and 2 diabetes
47
Clinical Manifestations
Classic clinical manifestations include the “3 Ps”: polyuria,
polydipsia, and polyphagia
Other symptoms include
Dehydration, weight loss, fatigue and weakness,
Vision changes
Tingling or numbness in hands or feet
Skin lesions, wounds that are slow to heal
Recurrent infections
48
Diagnosis
Abnormally high blood glucose level
The following may be used:
─Fasting plasma glucose (FPG)
─Random plasma glucose
─2-hour post-load glucose
49
ADA’s diagnostic criteria for diabetes
Symptoms of diabetes (polyuria, polydipsia, weight
loss) plus casual plasma glucose concentration ≥200
mg/dL (11.1 mmol/L).
Fasting plasma glucose ≥126 mg/dL (7.0 mmol/L).
Two-hour postload glucose ≥200 mg/dL (11.1 mmol/L)
Glycated haemoglobin A1C ≥6.5% (48 mmol/mol).
OR
OR
OR
50
Medical Management
Diabetes management has five components:
1. Nutritional therapy
2. Exercise
3. Monitoring
4. Pharmacologic therapy
5. Education
51
Nutritional Therapy
Nutrition, weight control, and increased activity are the
foundation of diabetes management
Objectives
─control of total caloric intake to attain or maintain a
reasonable body weight,
─control of blood glucose levels, and
─normalization of lipids and blood pressure
52
Nutritional therapy…
For patients who require insulin:
Maintain as much consistency as possible in the amounts of
calories and carbohydrates ingested at each meal
Maintain consistency in the approximate time intervals
between meals, with the addition of snacks if necessary
For patients who are overweight and obese:
weight loss is an important part of treatment (weight loss of
>5% may improve BG levels)
53
Caloric Requirements and Distribution
Carbohydrates
─50% to 60% carbohydrates, 20% to 30% fat, and 10% to
20% protein
Fats
─reduce to less than 30% of total calories
─limit amount of saturated fats to10% of total calories.
─limit total intake of dietary cholesterol to <300 mg/day
54
Caloric Requirements…
Protein
─Use of some nonanimal sources of protein (e.g. legumes,
whole grains) to help reduce saturated fat and cholesterol
intake
Fiber
─Increased fiber in the diet may improve blood glucose levels
─At least 25 g of fiber should be ingested daily
Alcohol consumption
─moderate (1 bottle/day for women and 2 bottles/day for men)
55
Exercise
It lowers blood glucose and reduces CVD risk
It also alters blood lipid concentrations, increasing
levels of HDL and decreasing total cholesterol and TG
levels
Gradual increase in the exercise period is encouraged.
56
Exercise Recommendations
150 min/week (distributed over at least 3 days)
Exercise at the same time of day and for the same duration
each session
Use proper footwear
Avoid trauma to the lower extremities
Inspect feet daily after exercise
Avoid exercise in extreme heat or cold
Avoid exercise during periods of poor metabolic control
57
Exercise Precautions
Patients who require insulin should be taught to eat 15-
g carbohydrate snack or snack of complex
carbohydrates with protein before engaging in moderate
exercise
To avoid post-exercise hypoglycemia, especially after
strenuous or prolonged exercise, the patient may need to
eat snack at the end of the exercise session
Patients taking insulin and participating in extended
periods of exercise should test their BG before, during,
and after exercise period
58
Monitoring Glucose Levels
Self-monitoring of blood glucose (SMBG)
It is recommended that SMBG occurs when circumstances
call for it (e.g., before meals, snacks, and exercise)
Allows for detection and prevention of hypo/hyperglycemia
Every 6 to 12 months, patients should conduct a comparison
of their meter result with lab measured BG level
59
Frequency of SMBG
3 or more times daily for most patients who require
insulin,
At least 2 or 3 times per week for those not receiving
insulin
Whenever hypoglycemia or hyperglycemia is
suspected; with changes in medications, activity, or diet;
and with stress or illness
60
Pharmacologic Therapy
Insulin Therapy
In type I diabetes, exogenous insulin must be given
for life
In type 2 diabetes, insulin may be necessary on a long-
term basis to control BG if meal planning and oral
agents are ineffective or when insulin deficiency occurs
SMBG is a cornerstone of insulin therapy
61
Preparations of insulin
Based on the onset, peak, and duration of action
Rapid-acting insulins
More rapid effect and shorter duration of action
Patient should eat within 5 to 15 minutes of injection
Long-acting insulin (basal insulin) is required to
maintain glucose control
62
Preparations of insulin…
Short-acting insulins
called regular insulin (marked R on the bottle)
Regular insulin is a clear solution and is usually given
20 to 30 minutes before a meal
Can be given alone or with longer-acting insulin
63
Preparations of insulin…
Intermediate-acting insulins
called NPH insulin (neutral protamine Hagedorn) or Lente
insulin
Appear milky and cloudy
function as basal insulins but may have to be split into 2
injections to achieve 24-hour coverage.
If NPH or Lente insulin is taken alone, it is not crucial that it
be taken before a meal but patients should eat some food
around its time of onset and peak
64
Preparations of insulin…
Very long-acting insulins (basal insulin)
Absorbed very slowly over 24hrs and can be given once
a day
65
Preparations of insulin cont’d
66
Insulin Regimens
Conventional Regimen
One or more injections of a mixture of short and
intermediate-acting insulins per day
 Τ
𝟐
𝟑 of total dose in the morning (with Τ
𝟐
𝟑 long-acting
and Τ
𝟏
𝟑 short-acting insulin) and Τ
𝟏
𝟑 before the evening
meal (with Τ
𝟏
𝟐 long-acting and Τ
𝟏
𝟐 short-acting)
67
Conventional Regimen…
Total insulin dose per day
─Initiation: 0.2 - 0.4 units/kg/day
─Maintenance: roughly 0.6 - 0.7 units/kg/day
Regimen options commonly available in Ethiopian setting
NPH twice daily (before breakfast and at bed time) and
Regular insulin twice daily (before breakfast & before supper)
Premixed insulin (70% NPH & 30% regular) twice daily:
before breakfast and before supper
NPH twice daily: before breakfast and before bedtime
68
Intensive Regimen
3 or 4 injections of insulin per day
allows the patient more flexibility to change the insulin
doses from day to day
Intensive insulin therapy requires:
─Monitoring BG before breakfast, before lunch, before
dinner & before bed
─Adjusting insulin doses in response to given glucose
patterns
─Coordinating diet, exercise, and insulin therapy
69
Storing Insulin
All insulin, including spare pens and vials not in use,
should be refrigerated
Insulin pen or vial in use should be kept at room
temperature to reduce local irritation at injection site
Insulin can be kept at room temperature for 1 month
70
Preparing the Injection
Mixing Insulins
─Regular and NPH insulins can be mixed together in the
same syringe.
─NPH should be mixed carefully by rolling the vial gently.
─Regular insulin is drawn into syringe first, followed by
NPH
Premixed insulin in a vial or in a prefilled syringe can be
used
Premixed insulins: 70/30 (70% NPH and 30% regular
insulin), 50/50 71
Injection Site
72
Injection sites:
─abdomen,
─posterior surface of upper arms,
─anterior surface of the thighs
─flank area
Injection Site…
Use all available injection sites within one area rather
than randomly rotating sites from area to area
Or, always using the same area at the same time of day
(E.g. Morning into abdomen, evening into arms)
If patient plans to exercise, insulin should not be injected
into the limb that will be exercised → faster absorption
→hypoglycemia
73
Insulin Injection
Injection site is cleansed prior to insertion of needle
To inject insulin, the skin is gently pinched and needle
is inserted at 90-degree angle
─45-degree angle for patients with lower BMI
Injection sites should be at least 1 inch apart
Too deep or too shallow injection affects rate of
absorption
Note: Routine aspiration to assess blood is not necessary
74
Insulin Injection…
75
Self-injection of Insulin
1. With one hand, stabilize the skin by
spreading it or pinching up a large area
2. Pick up the syringe with the other hand and
hold it as you would a pencil. Insert the
needle straight into the skin
3. To inject the insulin, push in the plunger all
the way
4. Pull the needle straight out of the skin. Press
a cotton ball over the injection site for
several seconds
5. Use a disposable syringe only once and
discard it into a hard plastic container
Oral Antidiabetic Agents
1. Biguanides
2. Sulfonylureas
3. Alpha-glucosidase inhibitors
4. Nonsulfonylurea insulin secretagogues (meglitinides
and phenylalanine derivatives)
5. Thiazolidinediones (glitazones)
6. Dipeptidyl peptidase 4 (DPP-4) inhibitors
7. Glucagon-like peptide 1 (GLP-1) analogs
8. Sodium-glucose transporter 2 (SGLT-2) inhibitors
76
Biguanides: Metformin
Acts by decreasing hepatic production of glucose and
improves peripheral glucose utilization
Reduces fasting plasma glucose and insulin levels, and
promotes modest weight loss
As monotherapy and in combination with other oral
agents or with insulin
77
Sulfonylureas
Stimulate the pancreas directly to secrete insulin
A functioning pancreas is necessary
 Improve insulin action at the cellular level and also
may directly decrease hepatic glucose production
Most common side effect is hypoglycemia
Second-generation sulfonylureas (glipizide, glyburide,
glimepiride) are safer
78
Indications for insulin therapy in type 2
diabetes mellitus
Failure to control blood glucose with oral medicines
Temporary use for major stress, e.g. surgery, medical illness
Severe kidney or liver failure
Pregnancy
HbA1C >10%, FPG >250 mg/dl, RBS consistently >300
mg/dl, or ketonuria
When distinguishing type 1 from type 2 diabetes is difficult
82
Doses and contraindications
83
Drug Dose Contraindications
Metformin
 500mg PO daily with meals
 Titrate dose slowly based on BG
levels or HbA1C to a maximum dose
2000-2500mg
 Serum creatinine: >1.5
mg/dL (men), >1.4 mg/dL
(women),
 CHF, radiographic contrast
studies, seriously ill patients,
acidosis, hepatic failure
Glibenclamide
 2.5mg-5mg PO daily 30min before
breakfast
 Titrate dose slowly based on HbA1c
and/or FBG levels to 15mg daily
 When 7.5mg per day is needed,
divide total daily dose into 2, with
larger dose in the morning
 Elderly and patients with
renal impairment
Glimepiride
 1-2mg PO dailywith breakfast or the
first main meal
 Titrate dose slowly based on HbA1c
and/or FBG levels
 Maximum dose of 8mg once daily
 Hypersensitivity to sulfonyl
ureas or sulfonamides,
 breast feeding
 DKA
Insulin initiation and dose increment in type-2 diabetes
84
Regimen Insulin
type
Starting
dose
Increment Alternative
dosing
Add on-to
oral agent
NPH 10 units
before
bedtime
2–4 units
in 3-7
days
Higher dose may be
started in patients
with severe
hyperglycemia
Substitutio
n
Therapy
(Insulin
substitutin
g
all oral
agents)
NPH 15 units
• 10 units,
30min
Before
breakfast
• 5 units,
30min
before supper
4 units in
3-7 days
Higher dose may
be started in
patients with
severe
hyperglycemia
85
Management of other cardiovascular risk factors
Drug Dose Indications
Aspirin
 75–162mg PO daily  Increased cardiovascular risk (10-year risk
>10%)
 Men >50years or women >60years with at
least one additional major risk factor
(hypertension, smoking, dyslipidemia,
albuminuria and family history of CVD)
Statins  Simvastatin, 10-40mg
PO daily
 Atorvastatin 10-
40mg PO daily
 Rosuvastatin 5-20mg
PO daily
 Lovastatin 20-80mg P
O daily
 Overt CVD
 >40 years of age and have one or more
other CVD risk factors
 Without CVD and <40 years- if LDL
cholesterol remains >100mg/dl or have
multiple CVD risk factors,
Sequential therapy in Type 2 Diabetes
86
Healthy eating, weight control, increased
physical activity
Metformin
Two medicine therapies
Glycemic targets not meet in 3 months
Metformin +
Sulfonylurea
Metformin +
Basal Insulin
Three medicine therapies
Metformin + Sulfonylurea + Basal
Insulin
Glycemic targets not meet in 3 months
Glycemic
targets
not
meet
in
3-6
months
Complex Insulin
regimens i.e.
Multiple insulin
injections per day
Education
Provide the patient with basic knowledge and skills for diabetes
management
Include the following:
─Simple pathophysiology
─Treatment modalities
─Recognition, treatment, and prevention of acute complications
Provide also the patient with detailed information to foster self-
reliance and independence for diabetes management at home
Educate on skills and information to improve lifestyle and
individualization of diabetes self-management
87
Glycemic Targets for Non-Pregnant Adults with
Diabetes
88
Fasting plasma glucose (capillary) 70-130 mg/dl
Postprandial (1–2 hrs after beginning of
meal) plasma glucose
< 180 mg/dl
Haemoglobin A1C < 7%
Acute complications
of diabetes
89
Acute complications of diabetes
1. Hypoglycemia (Insulin Reaction)
2. Diabetic ketoacidosis
3. Hyperglycemic hyperosmolar syndrome
90
Hypoglycemia
Blood glucose <70 mg/dL (3.9 mmol/L)
It can cause serious morbidity; if severe it can be fatal
Its incidence is lower in T2DM than in T1DM
It often occurs before meals (if meals are delayed/omitted)
Causes
─too much insulin or oral hypoglycemic agents,
─too little food, or
─ excessive physical activity
91
Hypoglycemia…
Hypoglycemia may be documented by Whipple’s
triad:
1. Symptoms consistent with hypoglycemia
2. Low plasma glucose concentration measured with a
precise method
3. Relief of symptoms after plasma glucose level is
raised
92
93
Fig: Physiology of glucose counterregulation: Mechanisms that normally prevent or
rapidly correct hypoglycemia
94
Clinical Manifestations
2 categories of symptoms:
─Autonomic nervous system (ANS) symptoms
─Central nervous system (CNS) symptoms
In mild hypoglycemia, ANS is stimulated
─Adrenergic symptoms: tachycardia, palpitations,
tremor, and anxiety
─Cholinergic symptoms: sweating, hunger, and
paresthesiae 95
C/M….
In moderate hypoglycemia
─inability to concentrate, headache, lightheadedness,
confusion, memory lapses, slurred speech, impaired
coordination, emotional changes, irrational or
combative behaviour
In severe hypoglycemia,
─disoriented behavior, seizures, difficulty arousing
from sleep, or loss of consciousness
96
C/M…
Hypoglycemia unawareness
Caused by attenuated sympathoadrenal response to
hypoglycemia
Loss of warning adrenergic and cholinergic symptoms
Occurs in some pts who have had diabetes for many
years
Affected pts must perform SMBG on frequent basis
97
Management
Giving carbohydrates (CHO)
─15 to 20 g of fast-acting concentrated source of
glucose orally
Sources of glucose for include:
─3 or 4 commercially prepared glucose tablets
─4 to 6 oz of fruit juice or regular soda
─6 to 10 hard candies
─2 to 3 teaspoons of sugar or honey
98
Management…
BG level should be retested in 15 minutes and retreated
with another 15 g if the patient is still hypoglycemic.
If symptoms persist for > 15minutes after initial
treatment, treatment is repeated even if BG testing is not
possible
Once BG has come to normal, snack or meal containing
protein and starch (e.g., milk or cheese) is
recommended to prevent recurrent hypoglycemia
99
Management…
25 to 50 mL D50W via IV push at a rate of 10 mL/min
Glucagon 1 mg IV or SC can be administered if
patient is unconscious or unable to swallow
100
Diabetic Ketoacidosis (DKA)
DKA is caused by absence or markedly inadequate
amount of insulin
3 main clinical features of DKA are:
─Hyperglycemia
─Dehydration and electrolyte loss
─Acidosis
101
DKA…
Causes of DKA
Insufficient or missed doses of insulin
Physical or emotional stress
Illness or infection
Undiagnosed and untreated diabetes
102
Pathophysiology
Insulin deficiency → reduced amount of glucose
entering the cells and increased hepatic glucose
production and release → hyperglycemia
Kidneys excrete excess glucose → osmotic diuresis →
dehydration and electrolytes loss
Hyperosmolality of blood → stimulation of thirst →
polydipsia and fluid shifting from intracellular to
extracellular space → low serum sodium level
103
Pathophysiology…
Insulin deficiency → breakdown of fat into free fatty acids
→ free fatty acids conversion into ketone
bodies→metabolic acidosis
Metabolic acidosis → respiratory system blows off
CO2→rapid deep respirations (Kussmaul respirations)
Ketones (volatile acid), as they are exhaled, they may
manifest as acetone breath that has a fruity odor similar to
overripe apples
104
Clinical manifestations
Polyuria, polydipsia, weakness, and malaise
Blurred vision → due to osmotic changes to lens
Orthostatic hypotension; warm, dry skin; decreased
skin turgor; flat neck veins; and dry mucous membranes
Weak, rapid pulse
Anorexia, nausea, vomiting, and abdominal pain
Acetone breath & Kussmaul respirations
105
Diagnostic findings
Blood glucose levels >250 mg/dL
Low serum pH (6.8 to 7.3)
Low serum bicarbonate (0 to 15 mEq/L)
Urine glucose (usually >3+), Urine ketone (usually >2+)
Abnormal levels of serum electrolytes (Na+, K+, and Cl-)
Increased creatinine, BUN, and Hematocrit may be seen with
dehydration
Others: CBC, Blood and urine culture, Blood film, Chest X-ray
106
Management of DKA
Rehydration
2 to 3 L of IV fluid (0.9% NaCl solution) at 0.5 -
1L/hr for 1-3 hours, but the patient may need as much
as 6 to 10 L
Use 0.45% NaCl solution for pts with hypertension or
hypernatremia
Change IV solution to D5W when BG level becomes
≤250mg/dL
107
Management of DKA…
Reversing acidosis
Administer short-acting regular insulin: 0.1 units/kg IV
bolus, then 0.1 units/kg/hour or 5 units/hour by continuous
IV infusion; increase 2 – 3 fold if no response by 2–4 h.
If initial serum potassium is <3.3 mEq/L, do not administer
insulin until it is corrected
Even if BG levels are decreasing, insulin drip must not be
stopped until SC insulin therapy has been started or until
serum bicarbonate level ≥15 mEq/L and anion gap is ≤12
─Instead, rate of D5W infusion can be increased
108
Management of DKA…
Restoring Electrolytes
Monitor serum K+ levels carefully during Rx of DKA
Insulin administration or rehydration will decrease serum K+
If initial serum potassium is >5.2 mEq/L, do not supplement K+
until it is corrected
Give 10mEq/h when plasma K+ <5.0–5.2 meq/L (or 20–30 meq/L
of infusion fluid), ECG normal, urine flow and normal creatinine
documented
Administer 40–80 meq/h when plasma K+ <3.5 meq/L or if
bicarbonate is given
If K+ determination is not possible delay initiation of K+
replacement until there is reasonable urine put(>50 ml/hr)
109
Management of DKA…
Assess patient for precipitating factors (noncompliance,
infection, trauma, pregnancy, infarction, cocaine).
Initiate appropriate investigation (cultures, CXR, ECG)
Measure BG every 1–2 h; measure electrolytes
(especially K+, bicarbonate, phosphate) and anion gap
every 4 h for first 24 h
Monitor blood pressure, pulse, respirations, mental
status, fluid I&O every 1–4 h
110
Management of DKA…
Continue above Rx until patient is stable, glucose goal is
150–200 mg/dL, and acidosis is resolved. Insulin infusion
may be decreased to 0.02–0.1 units/kg per hour.
Administer long-acting insulin as soon as patient is eating
Allow for a 2–4 hour overlap in insulin infusion and SC
long-acting insulin injection
Blood glucose usually improves at a rate of 50 to
100mg/dL/hr
111
Management…
Patient education about symptoms of DKA, its precipitating
factors, and management of diabetes during concurrent illness
During illness or when oral intake is compromised, pts should:
─Frequently measure capillary blood glucose
─Measure urinary ketones when serum glucose is >250 mg/dL
─Drink fluids to maintain hydration
─Continue or increase insulin
─Seek medical attention if dehydration, persistent vomiting, or
uncontrolled hyperglycemia develop
112
Hyperglycemic Hyperosmolar
Syndrome (HHS)
 HHS is a serious life-threatening condition characterized by
hyperosmolality (≥350 mOsm/L) and hyperglycemia (≥600
mg/dL) with alterations in level of consciousness
Results from relative insulin deficiency initiated by illness
and inadequate fluid intake
Hyperglycemia induces osmotic diuresis that leads to
intravascular volume depletion, which is exacerbated by
inadequate fluid replacement
113
HHS cont’d
HHS occurs most often in older people (b/n 50 & 70 yrs) with
no known history of diabetes or who have type 2 diabetes
Ketosis and acidosis is usually minimal or absent
HHS often can be precipitated by:
─Infection, acute or chronic illness (e.g, pneumonia, sepsis)
─Stroke or dementia
─Medications that exacerbate hyperglycemia (e.g thiazides)
─Therapeutic procedures, such as surgery or dialysis
114
Clinical Manifestations
Hypotension, tachycardia, and altered mental status
Profound dehydration (dry MM, poor skin turgor)
Variable neurologic signs secondary to cerebral
dehydration
─alteration of sensorium, seizures, hemiparesis
Nausea, vomiting, abdominal pain, and Kussmaul
respirations are absent
115
Diagnostic findings
Blood glucose, serum osmolality
─BG level is usually 600 to 1200 mg/dL
─Osmolality exceeds 350 mOsm/kg
ABG analysis
BUN, Electrolyte
CBC
116
Management of HHS
Overall approach to treatment is similar to that of DKA
Fluid replacement
1–3L of 0.9% NS over the first 2–3 h. If the serum sodium
is >150 mEq/L, 0.45% saline should be used
Change to D5W when BG decreases to 250 to 300 mg/dL
After hemodynamic stability is achieved, give hypotonic
fluids (0.45% saline initially, then D5W) over the next 1–2
days at rates of 200–300 mL/h
117
Management of HHS…
Insulin administration
IV insulin bolus of 0.1 unit/kg followed by IV insulin at a
constant infusion rate of 0.1 unit/kg/hr
If BG does not fall, increase insulin infusion rate by two fold
Insulin infusion should be continued until pt has resumed
eating and can be transferred to SC insulin regimen
Correction of electrolyte imbalances
K+ repletion is usually necessary depending on serum K+
level
118
119
Diabetes Insipidus
120
Learning objectives
At the end of this lesson, students will be able to:
Define diabetes insipidus
Describe etiologic factors of diabetes insipidus
Explain clinical manifestations of diabetes insipidus
Discuss management strategies of diabetes insipidus
121
Diabetes insipidus (DI)
DI is a disorder of posterior lobe of pituitary gland
characterized by deficiency of ADH
It is characterized by polydipsia and large volumes of
dilute urine
Types
Neurogenic DI: results from destruction of posterior
pituitary gland, resulting in lack of vasopressin
Nephrogenic DI: results from drug-related damage to
renal tubules, resulting in inability to conserve water
Psychogenic DI: caused by excessive water intake
122
Risk factors
Head trauma, brain tumor
Surgical ablation or irradiation of pituitary gland
CNS infections
Failure of renal tubules to respond to ADH
─Due to hypokalemia, hypercalcemia, and
medications (e.g., lithium, demeclocycline)
123
Clinical Manifestations
Very dilute urine (3 to 20 L) with nocturia
Frequency of urination
Specific gravity of 1.001 to 1.005
Signs and symptoms of fluid volume deficit including:
─Weight loss
─Poor skin turgor
─Dry mucous membranes
─Hypotension, increased heart rate
Patient tends to drink 2 to 20 L of fluid daily
124
Diagnosis
24-hour urine collection to measure volume and
creatinine
Plasma levels of ADH (normal: 1.3-4.1pg/mL)
Plasma and urine osmolality
Fluid deprivation test
Vasopressin challenge test
─Desmopressin is administered IV
125
Medical Management
Objectives
─To replace ADH (usually a long-term therapeutic program)
─To ensure adequate fluid replacement
─To identify and correct the underlying pathology
Medications
─Desmopressin/DDAVP (synthetic vasopressin)
─Other: chlorpropamide, thiazide diuretics, and/or
prostaglandin inhibitors (e.g., ibuprofen, indomethacin, and
aspirin)
126
Nursing management
Educate patient, family, and other caregivers about follow-up
care, prevention of complications, and emergency measures
Instruct about dose, actions, side effects, & administration of
all medications and signs and symptoms of hyponatremia
Demonstrate and observe return demonstration of medication
administration to ensure patient received prescribed dosage
Advise to wear medical identification bracelet and carry
required medication and information about DI at all times
127
Disorders of
Thyroid Gland
128
Learning objectives
At the end of this lesson, students will be able to:
Differentiate between hypothyroidism and hyperthyroidism
Describe causes of hypothyroidism and hyperthyroidism
Describe diagnostic methods used for hypothyroidism and
hyperthyroidism
Describe management of hypothyroidism and
hyperthyroidism
129
Hypothyroidism
Results from suboptimal levels of thyroid hormone
It can range from mild, subclinical forms to myxedema
(severe deficiency)
Primary or thyroidal hypothyroidism
Central hypothyroidism
─Pituitary or secondary hypothyroidism
─Hypothalamic or tertiary hypothyroidism
Neonatal hypothyroidism: present at birth
130
Causes
Autoimmune disease (Hashimoto thyroiditis)
Iodine deficiency
Therapy for hyperthyroidism
─Radioactive iodine, thyroidectomy
─Antithyroid medications
Atrophy of thyroid gland with aging
Radiation to head and neck
131
Pathophysiology
Decreased T4 leads to stimulation of TSH in the
pituitary gland
TSH stimulates secretion of T3 to increase production
of T4, leading to hypertrophy of thyroid gland
Laboratory findings
─Decreased T3 (normal: 260-480pg/dl)
─Decreased T4 (normal: 5.4-11.5mcg/dl)
─Increased TSH (normal: 0-15mIU/L)
132
Clinical Manifestations
Extreme fatigue, air loss, brittle nails, and dry and thick skin
Numbness and tingling of the fingers
Voice may become husky, and hoarseness
Menorrhagia, amenorrhea, loss of libido
Respiratory muscle weakness, Inadequate ventilation, and
sleep apnea
Elevated serum cholesterol, atherosclerosis, CAD, poor left
ventricular function, and pericardial effusion
133
Clinical Manifestations…
Face becomes expressionless and masklike
Subnormal body temperature and pulse rate
Weight gain even without increase in food intake
Irritability, fatigue, constipation, mental processes
become dulled
Speech is slow, tongue enlarges, hands and feet
increase in size, and deafness
134
Medical Management
Objectives
─To restore normal metabolic state
─To prevent disease progression and complications
Pharmacologic Therapy
─Synthetic levothyroxine (75 to 150 mcg per day)
─IV administration of T4 and T3 for myxedema coma
until the patient is safe to take oral form
135
Nursing Management
Monitor patient’s vital signs and cognitive level closely
Maintain vital functions, such as managing
cardiopulmonary status, hyponatremia, and
hypoglycemia
Monitor blood glucose levels closely
Take precautions during course of therapy because of
interaction of thyroid hormones with other medications
136
Hyperthyroidism
It is the 2nd most prevalent endocrine disorder, after
diabetes
It results of overproduction of T3, T4, or both
It is manifested by a greatly increased metabolic rate
Usually oversecretion of T3 and T4 is associated with
enlarged thyroid gland
Most common causes: Graves disease, toxic
multinodular goiter, and toxic adenoma
137
Hyperthyroidism…
Graves disease
Autoimmune disorder resulting from excessive output
of thyroid hormones caused by abnormal stimulation of
thyroid gland
Affects women eight times more frequently than men
138
Clinical Manifestations
Nervousness, emotionally hyperexcitable, irritable, and
apprehensive
Inability to sit quietly
Heat intolerance, perspiration
Skin appears flushed and feels warm, soft, and moist
Increased appetite and dietary intake
Weight loss, fatigability and weakness
139
Clinical Manifestations…
Ophthalmopathy (eg. Exophthalmo)
Amenorrhea and changes in bowel function
Palpitations, increased pulse
Atrial fibrillation, sinus tachycardia or dysrhythmias,
increased pulse pressure
Myocardial hypertrophy and heart failure if left
untreated
140
Diagnosis
P/E: thyroid gland is enlarged, feels soft, and may
pulsate; often thrill can be palpated, and bruit is heard
over thyroid arteries
─signs of increased blood flow through thyroid gland
ECG
↓sed serum TSH, ↑sed T3 and T4, and ↑se in radioactive
iodine uptake
141
Management
Aims: To reduce thyroid hyperactivity, relieve symptoms,
and prevent complications
Treatment consists of combination of radioactive iodine,
antithyroid agents, and surgery
Radioactive iodine 131 therapy
─Destroys the overactive thyroid cells
─Almost all body’s iodine are concentrated in thyroid
gland
142
Management…
Antithyroid drugs
Inhibits one or more stages in thyroid hormone synthesis or
release
Most commonly, propylthiouracil (PTU) or methimazole
(Tapazole) is used until the patient is euthyroid.
─These medications block the conversion of T4 to T3
Adjunctive Therapy to antithyroid drugs
Propranolol: to control nervousness, tachycardia, tremor,
anxiety, and heat intolerance
143
Management…
Thyroidectomy
Indications: pregnant women allergic to antithyroid drugs,
patients with large goiters, or patients unable to take
antithyroid drugs
Performed soon after thyroid function has returned to
normal (4 to 6 weeks)
Surgical removal of about five sixths of thyroid tissue
(subtotal thyroidectomy) reliably results in a prolonged
remission in most patients with exophthalmic goiter
144
145
Disorders of
parathyroid gland
146
Learning objectives
At the end of this lesson, students will be able to:
Differentiate between hypoparathyroidism and
hyperparathyroidism
Describe causes of hypothyroidism and hyperthyroidism
Describe diagnostic methods used for hypoparathyroidism
and hyperparathyroidism
Describe management of hypoparathyroidism and
hyperparathyroidism
147
Hyperparathyroidism
It is caused by overproduction of parathormone
It is characterized by bone decalcification and
development of renal stone
Primary hyperparathyroidism
It occurs 2 to 4 times more often in women than in men
It is most common b/n 60 and 70 years of age
148
Hyperparathyroidism
Secondary hyperparathyroidism
It occurs in patients who have chronic kidney failure
and so-called renal rickets as a result of phosphorus
retention, increased stimulation of parathyroid glands,
and increased parathormone secretion
149
Clinical Manifestations
Patient may have no symptoms or may experience signs
and symptoms
Apathy, fatigue, muscle weakness, nausea, vomiting,
constipation, hypertension, and cardiac dysrhythmias
Irritability, neurosis, psychoses caused by the direct
action of calcium on the brain and nervous system
Decrease in excitation potential of nerve and muscle
tissue
150
Clinical Manifestations…
Nephrolithiasis, pyelonephritis, and kidney injury
Skeletal pain and tenderness
Pain on weight bearin
Pathologic fractures
Deformities, shortening of body stature
Peptic ulcer and pancreatitis
151
Diagnosis
Elevation of serum Ca++ levels and parathormone
Radioimmunoassays for parathormone
Bone changes may be detected on x-ray or bone scans
Double-antibody parathyroid hormone test is used to
distinguish between primary hyperparathyroidism and
malignancy
Ultrasound, MRI, thallium scan,and fine-needle biopsy
152
Management
Parathyroidectomy: surgical removal of abnormal
tissue
Daily fluid intake of 2,000 mL or more to prevent renal
stone formation
Thiazide diuretics are avoided
Patient is advised to avoid a diet with calcium
Monitor the patient to detect symptoms of tetany
closely
153
Hypoparathyroidism
It results from hyposecretion of parathyroid glands,
Leads to low levels of PTH that eventually results in
hypocalcemia and hyperphosphatemia
The most common cause is surgical removal of
parathyroid gland tissue during thyroidectomy,
parathyroidectomy, or radical neck dissection
154
Hypoparathyroidism…
In the absence of parathormone, there is decreased
intestinal absorption of dietary calcium and decreased
resorption of calcium from bone and through renal
tubules
Decreased renal excretion of phosphate causes
hypophosphaturia, and low serum calcium levels result
in hypocalciuria
155
Clinical Manifestations
Irritability of neuromuscular system and tetany
Symptoms of latent tetany: numbness, tingling, and
cramps in extremities, and stiffness in the hands and feet
Signs of overt tetany: bronchospasm, laryngeal spasm,
carpopedal spasm (flexion of the elbows and wrists and
extension of the carpophalangeal joints and dorsiflexion
of the feet), dysphagia, photophobia, cardiac
dysrhythmias, and seizures
Anxiety, irritability, depression, delirium
ECG changes and hypotension
156
Diagnostic Findings
Positive Chvostek sign or a positive Trousseau sign
suggests latent tetany
Chvostek sign is positive when sharp tapping over the facial
nerve just in front of parotid gland and anterior to ear causes
spasm or twitching of mouth, nose, and eye
Trousseau sign is positive when carpopedal spasm is
induced by occluding the blood flow to arm for 3 minutes
with a blood pressure cuff
Serum calcium & phosphate levels, x-rays of bone
157
Medical Management
Administer 10% calcium gluconate intravenously
If this does not decrease neuromuscular irritability and
seizure activity immediately, sedative agents, such as
pentobarbital, may be administered.
Parenteral PTH to treat acute hypoparathyroidism
with tetany
Diet high in calcium and low in phosphorus
158
Medical Management…
Aluminum hydroxide gel or aluminum carbonate
may be used after meals to bind phosphate and promote
its excretion through the GI tract
Vitamin D
─Dihydrotachysterol, ergocalciferol, or
cholecalciferol
─Enhances calcium absorption from the GI tract
159
Nursing Management
Keep calcium gluconate at the bedside in a locked
container or in a place where it is readily available
along with equipment necessary for IV administration.
Continuous cardiac monitoring and careful assessment
Educate patient about medications and diet therapy
Teach patient to contact the primary care provider if
these symptoms occur
160
Cushing syndrome
161
Learning objectives
At the end of this lesson, students will be able to:
Define Cushing syndrome
Describe causes of Cushing syndrome
Describe management Cushing syndrome
Describe diagnostic methods used for Cushing
syndrome
162
Cushing syndrome
It is a rare disorder characterized by high levels of
serum cortisol
3 causes of Cushing syndrome:
Pituitary tumor that overproduces ACTH
Adrenal tumor that overproduces ACTH
Long-term glucocorticoid therapy
163
Cushing syndrome…
It more frequently affects women,
Ectopic ACTH syndrome is more frequently identified
in men
Only 10% of patients with Cushing’s syndrome have
primary, adrenal cause
Use of glucocorticoids is the most common cause
164
Clinical Manifestations
C/Ms are primarily due to oversecretion of
glucocorticoids and androgens
Upregulation of gluconeogenesis, lipolysis, and protein
catabolism
Arrest of height, hypertension, hirsutism, and
depression
Thin, fragile, and easily traumatized skin
Ecchymoses, purple striae
165
Clinical Manifestations…
Muscle weakness, wasting, and thin extremities
Increased susceptibility to infection
Slow healing of minor cuts
Disturbed sleep
Osteoporosis, kyphosis, backache, and compression
fractures of vertebrae
166
Clinical Manifestations…
Altered fat metabolism results in a classic picture of
Cushing syndrome in the adult:
─Central obesity
─Protruding abdomen
─Fatty “buffalo hump” in the neck and
supraclavicular areas
─ “moon-faced” appearance
167
168
Buffalo hump
Facial hair
Moon face
Clinical Manifest…cont’d
Virilization in females
─Hirsutism, breasts atrophy, menses cease, clitoris
enlarges, and voice deepens
Libido is lost in men and women
169
170
171
Diagnosis
Serum cortisol
Urinary cortisol
Low-dose dexamethasone suppression tests
─1 mg of dexamethasone is administered orally at 11:00 PM,
and plasma cortisol level is obtained at 8:00 AM the next
morning
─Suppression of cortisol to <5mg/dL indicates hypothalamic–
pituitary–adrenal axis is functioning properly
CT, ultrasound, or MRI is performed to localize adrenal tissue and
detect tumors of adrenal gland
172
Management
If cause is pituitary tumors,
─surgical removal of tumor by transsphenoidal
hypophysectomy
─Radiation of the pituitary gland
Adrenalectomy in patients with unilateral primary
adrenal hypertrophy
Medical management for bilateral adrenal dysplasia
173
Management…
Temporary replacement therapy with hydrocortisone
may be necessary for several months, until the adrenal
glands begin to respond normally to the body’s needs.
Lifetime replacement of adrenal cortex hormones if
bilateral adrenalectomy is performed
174
Management…
If cause is ectopic ACTH secretion
─Adrenal enzyme inhibitors to reduce hyperadrenalism
─Metyrapone, aminoglutethimide, mitotane, and
ketoconazole
If cause is administration of corticosteroids
─Reduce or taper medication to the minimum dosage
─Alternate-day therapy decreases the symptoms of
Cushing syndrome and allows recovery of the adrenal
glands’ responsiveness to ACTH
175
Nursing Management
Establish a protective environment to prevent falls, fractures, and
other injuries to bones and soft tissues
Encourage foods high in protein, calcium, and vitamin D to
minimize muscle wasting and osteoporosis.
Assess pt frequently for subtle signs of infection because anti-
inflammatory effects of corticosteroids may mask the common
signs of inflammation and infection.
Assess skin and bony prominences frequently and encourage and
assist pt to change positions frequently to prevent skin breakdown
176
Reading assignment
Iodine deficiency related goiter
Thyroiditis (acute and chronic)
Thyroid Cancer
Addison’s diseases
177
Thank you
178

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Endocrine disorders 2023 REVISED.pdf

  • 1. Endocrine Disorders By: Robera D. (BSc, MSc) Department of Nursing School of Nursing and Midwifery Institute of Health Sciences Wallaga University
  • 2. Review of Anatomy and Physiology 3
  • 3. Learning objectives Upon completion of this lesson, students will be able to: Identify major endocrine glands, their anatomic location, and hormones they secrete Summarize major action of hormones secreted from each gland Name disorders produced by over- and under-secretion of hormones 4
  • 4. Review of anatomy and physiology Endocrine system (ES) is involved in regulating metabolism, tissue function, reproduction, growth, and development Endocrine glands: pituitary, thyroid, parathyroids, adrenals, pancreatic islets, ovaries, and testes ─They secrete their hormones into blood Hormones: chemical messengers with specific target tissue, where it impacts cells’ functions and reactions 5
  • 5. Review of anatomy and physiology… Hypothalamus is the link between NS and ES ─It controls pituitary Hormone concentration in blood is maintained at a relatively constant level according to need by negative feedback mechanism 6
  • 6. 7 Figure 1: Hypothalamic and pituitary hormones and their target organs
  • 7. Glands of the Endocrine System 8
  • 8. Pituitary gland Located on the inferior aspect of the brain Secretes hormones that control secretion of hormones by other endocrine glands GHRH, GnRH, TRH, CRH, oxytocin and vasopressin ─produced and released by hypothalamus ─act on cells of the pituitary gland 9
  • 9. Pituitary gland… Anterior pituitary gland 1. Follicle-stimulating hormone (FSH) 2. Luteinizing hormone (LH) 3. Adrenocorticotropic hormone (ACTH) 4. Thyroid-stimulating hormone (TSH) 5. Prolactin (PRL) 6. Growth hormone (GH) Posterior pituitary gland 1. Vasopressin (or ADH) 2. Oxytocin 10
  • 10. Thyroid gland Butterfly-shaped organ located in lower neck, anterior to trachea Blood flow to the thyroid is very high (about 5 mL/min per gram of thyroid tissue) 3 hormones: 1. Thyroxine (T4): controls cellular metabolic activity 2. Triiodothyronine (T3): controls cellular metabolic activity 3. Calcitonin: reduces plasma level of calcium 11
  • 11. Parathyroid Glands 12 Situated in the neck and embedded in the posterior aspect of the thyroid gland Parathyroid hormone ─Lowers phosphorus and rises calcium in blood
  • 12. Adrenal Glands 13 There are two adrenal glands, one attached to the upper portion of each kidney ACTH stimulates adrenal cortex to secrete adrenal hormones Adrenal hormones: glucocorticoids, mineralocorticoids, sex hormones Adrenal medulla secretes catecholamines
  • 13. Glucocorticoids (e.g. Cortisol) Influence on glucose metabolism (↑BG) : Increased cortisol secretion results in elevated blood glucose Inhibit inflammatory response (powerful immune suppressant) 14
  • 14. Mineralocorticoids (e.g. Aldosterone) Involved in electrolyte metabolism Act principally on renal tubules and GI epithelium to cause increased Na+ absorption in exchange for excretion of K+ or H+ Aldosterone is the primary mineralocorticoid It is primarily secreted in response to presence of angiotensin II 15
  • 15. Adrenal Sex Hormones Androgens ─exert effects similar to those of male sex hormones Female sex hormones ─Adrenal gland may also secrete small amounts of some estrogens 16
  • 16. Pancreatic Islets Pancreas lies transversely in the upper abdomen Beta cells of pancreas secrete insulin, Insulin facilitates glucose transport into cells alpha cells of pancreatic islets secrete glucagon when blood glucose level is low Glucagon promotes gluconeogenesis to raise glucose level Delta cells secrete somatostatin 17
  • 17. Assessment Health history Ask if they have experienced changes: Energy level Tolerance to heat or cold Weight Thirst Frequency of urination Bowel function Fat and fluid distribution Secondary sexual characteristics (e.g., loss or growth of hair) Any enlargement of thyroid gland 18
  • 18. Assessment… Physical examination Vital signs Head-to-toe inspection Palpation of skin, hair, and thyroid Abnormal findings ─Facial hair in women, buffalo hump, vision changes, thinning of the skin, obesity of the trunk 19
  • 19. Inspect the neck for thyroid gland Tilt patient’s head slightly back Using lighting directed downward from the tip of the patient’s chin, inspect region below cricoid cartilage to identify contours of the gland 20
  • 20. 21
  • 21. Observe patient swallowing Ask the patient to sip some water and to extend the neck again and swallow. Watch for upward movement of thyroid gland, noting its contour and symmetry Thyroid cartilage, cricoid cartilage, and thyroid gland all rise with swallowing and then fall to their resting positions With swallowing, lower border of this large gland rises and looks less symmetric 22
  • 22. Palpate thyroid gland With the patient seating or standing Stand behind the patient, ask the patient to flex the neck slightly forward Gently place fingers of both hands on patient’s neck so that your index fingers are just below cricoid cartilage Ask the patient to sip and swallow Feel for the thyroid isthmus rising up under your finger pads 23
  • 23. Palpate thyroid gland… Normal ─small, smooth, firm, nontender, free of nodules Abnormal: ─soft in Graves disease ─firm in Hashimoto thyroiditis and malignancy ─tender in thyroiditis 24
  • 24. Click here to see video 25
  • 26. Learning objectives At the end of this lesson, students will be able to: Differentiate between type 1 and type 2 diabetes Describe etiologic factors associated with diabetes Explain diagnostic procedures of diabetes Describe management strategies for diabetes Differentiate between diabetic ketoacidosis and hyperosmolar nonketotic syndrome 27
  • 27. Definition Diabetes is a group of metabolic diseases characterized by hyperglycemia resulting from defects in insulin secretion, insulin action, or both It is a chronic illness that requires medical care and patient self-management Has physical, social, & economic consequences 28
  • 28. Normal and abnormal blood glucose levels 29 2 hr post-load glucose FPG 0 7 0 - - 10 0 12 6 - Diabetes Prediabete s(IFG) Normal Hypoglycemi a - 14 0 20 0 - Hypoglycemi a Normal Diabetes Prediabete s (IGT) RBS Hypoglycemi a Normal Diabetes
  • 29. Risk Factors Family history (e.g., parents or siblings with diabetes Obesity Age >30 years for type 2 and <30 years for type 1 Previously identified impaired fasting glucose or impaired glucose tolerance Hypertension High-density lipoprotein (HDL) cholesterol ≤35 mg/dL and/or triglyceride level ≥250 mg/dL History of gestational diabetes or delivery of a baby over 9 lb 30
  • 30. Classification 1. Type 1 diabetes (5 – 10% of all diabetes) 2. Type 2 diabetes (90 – 95% of all diabetes) 3. Gestational diabetes 4. Latent autoimmune diabetes of adult (LADA) 5. Diabetes associated with other conditions or syndromes 31
  • 31. Pathophysiology Insulin controls blood glucose levels by regulating the production, use, and storage of glucose. In patients with diabetes, cells may respond inadequately to insulin or the pancreas may decrease insulin secretion or stop insulin production completely. When person eats a meal, insulin secretion increases and moves glucose from the blood into muscle, liver, and fat cells. (in healthy person) 32
  • 32. Pathophysiology… During fasting periods, the pancreas continuously releases a small amount of “basal” insulin 33
  • 33. Pathophysiology… If the blood sugar becomes too low, glucagon is secreted Glucagon stimulates liver to release stored glucose, thereby increasing the blood sugar. They work together to maintain a constant level of glucose in the blood. Liver assists with glucose control (glycogenolysis & gluconeogenesis) 34
  • 34. Pathophysiology… Once inside the cells, insulin functions in the following ways: ─Transports and metabolizes glucose for energy ─Stimulates storage of glucose in the liver and muscle cells ─Signals liver cells to stop the release of glucose ─Enhances storage of dietary fat in adipose tissue ─Accelerates transport of amino acids into cells ─Facilitates the transport of potassium into the cells ─Inhibits the breakdown of stored glucose, protein, and fat 35
  • 35. Type 1 Diabetes It is often characterized by acute onset and most commonly affects children and young adults, although it can occur at any age It is characterized by destruction of pancreatic beta cells It develops as a result of autoimmunity against beta cells It is believed that autoimmunity destruction is initiated by a combination of genetic, immunologic, and environmental factors 36
  • 36. Type 1 Diabetes… Although events are not fully understood, it is generally accepted that genetic susceptibility is a common underlying factor in the development of type 1 diabetes. People do not inherit type 1 diabetes itself but rather a genetic predisposition, or tendency, toward the development of type 1 diabetes. This genetic tendency has been found in people with certain human leukocyte antigen types 37
  • 37. Type 1 diabetes cont’d Beta cell destruction Decreased insulin production Increased glucose production by the liver, and fasting hyperglycaemia Glucose from food cannot be stored in the liver but instead remains in the bloodstream and contributes to postprandial hyperglycemia 38
  • 38. Type 1 diabetes… If concentration of glucose in blood exceeds renal threshold for glucose, kidneys may not reabsorb all of filtered glucose; glycosuria occurs As glucose is excreted in urine, water follows it (osmotic diuresis) Fat breakdown results in increased production of ketone bodies (ketoacidosis) 39
  • 39. Type 1 diabetes… Increased blood glucose level pulls cellular water into blood → cellular dehydration→ polydipsia Deficiency of insulin Glucose will not be conveyed from extracellular to intracellular compartment Cells become energy depleted fat & protein will be drawn from adipose tissue & muscle & and ketosis ↑sed appetite (polyphagia) 40
  • 40. Type 2 Diabetes It occurs more commonly in who are >30yrs and obese Characterized by insulin resistance, impaired insulin secretion, and increased hepatic glucose production Insulin resistance refers to ↓sed tissue sensitivity to insulin. Exact mechanisms of insulin resistance and impaired insulin secretion are unknown Although increasing age, obesity, and lack of physical exercise as well as genetic factors are thought to play a role 41
  • 41. Type 2 diabetes… Type 2 DM has a strong genetic component  In early stages of type 2 diabetes, glucose tolerance remains near-normal, despite insulin resistance, because beta cells compensate by increasing insulin output As insulin resistance and compensatory hyperinsulinemia progress, pancreatic islets are unable to sustain the hyperinsulinemic state IGT then develops 42
  • 42. Type 2 diabetes… Further decline in insulin secretion and increase in hepatic glucose production lead to overt diabetes Glucagon is relatively overproduced and secreted, further augmenting hepatic glucose production There is enough insulin present to prevent the breakdown of fat Note: Impaired insulin secretion contribute to the pathogenesis of type 2 DM 43
  • 43. 44
  • 44. Gestational Diabetes (GD) Glucose intolerance developing during 2nd or 3rd trimester of pregnancy Hyperglycemia develops during pregnancy because of secretion of placental hormones, which causes insulin resistance 45
  • 45. Gestational diabetes cont’d Most women with GD revert to normal glucose tolerance postpartum but have a substantial risk (35– 60%) of developing diabetes in the next 10–20 yrs Women with a history of GD should ─undergo lifelong screening for the development of diabetes or prediabetes at least every 3 years. ─be counselled to maintain her ideal body weight and to exercise regularly 46
  • 46. Latent Autoimmune Diabetes of Adults (LADA) LADA is a subtype of diabetes in which the progression of autoimmune beta cell destruction in the pancreas is slower than in types 1 and 2 diabetes Patients with LADA are not insulin-dependent in the initial 6 months of disease onset. Clinical manifestation of LADA shares the features of types 1 and 2 diabetes 47
  • 47. Clinical Manifestations Classic clinical manifestations include the “3 Ps”: polyuria, polydipsia, and polyphagia Other symptoms include Dehydration, weight loss, fatigue and weakness, Vision changes Tingling or numbness in hands or feet Skin lesions, wounds that are slow to heal Recurrent infections 48
  • 48. Diagnosis Abnormally high blood glucose level The following may be used: ─Fasting plasma glucose (FPG) ─Random plasma glucose ─2-hour post-load glucose 49
  • 49. ADA’s diagnostic criteria for diabetes Symptoms of diabetes (polyuria, polydipsia, weight loss) plus casual plasma glucose concentration ≥200 mg/dL (11.1 mmol/L). Fasting plasma glucose ≥126 mg/dL (7.0 mmol/L). Two-hour postload glucose ≥200 mg/dL (11.1 mmol/L) Glycated haemoglobin A1C ≥6.5% (48 mmol/mol). OR OR OR 50
  • 50. Medical Management Diabetes management has five components: 1. Nutritional therapy 2. Exercise 3. Monitoring 4. Pharmacologic therapy 5. Education 51
  • 51. Nutritional Therapy Nutrition, weight control, and increased activity are the foundation of diabetes management Objectives ─control of total caloric intake to attain or maintain a reasonable body weight, ─control of blood glucose levels, and ─normalization of lipids and blood pressure 52
  • 52. Nutritional therapy… For patients who require insulin: Maintain as much consistency as possible in the amounts of calories and carbohydrates ingested at each meal Maintain consistency in the approximate time intervals between meals, with the addition of snacks if necessary For patients who are overweight and obese: weight loss is an important part of treatment (weight loss of >5% may improve BG levels) 53
  • 53. Caloric Requirements and Distribution Carbohydrates ─50% to 60% carbohydrates, 20% to 30% fat, and 10% to 20% protein Fats ─reduce to less than 30% of total calories ─limit amount of saturated fats to10% of total calories. ─limit total intake of dietary cholesterol to <300 mg/day 54
  • 54. Caloric Requirements… Protein ─Use of some nonanimal sources of protein (e.g. legumes, whole grains) to help reduce saturated fat and cholesterol intake Fiber ─Increased fiber in the diet may improve blood glucose levels ─At least 25 g of fiber should be ingested daily Alcohol consumption ─moderate (1 bottle/day for women and 2 bottles/day for men) 55
  • 55. Exercise It lowers blood glucose and reduces CVD risk It also alters blood lipid concentrations, increasing levels of HDL and decreasing total cholesterol and TG levels Gradual increase in the exercise period is encouraged. 56
  • 56. Exercise Recommendations 150 min/week (distributed over at least 3 days) Exercise at the same time of day and for the same duration each session Use proper footwear Avoid trauma to the lower extremities Inspect feet daily after exercise Avoid exercise in extreme heat or cold Avoid exercise during periods of poor metabolic control 57
  • 57. Exercise Precautions Patients who require insulin should be taught to eat 15- g carbohydrate snack or snack of complex carbohydrates with protein before engaging in moderate exercise To avoid post-exercise hypoglycemia, especially after strenuous or prolonged exercise, the patient may need to eat snack at the end of the exercise session Patients taking insulin and participating in extended periods of exercise should test their BG before, during, and after exercise period 58
  • 58. Monitoring Glucose Levels Self-monitoring of blood glucose (SMBG) It is recommended that SMBG occurs when circumstances call for it (e.g., before meals, snacks, and exercise) Allows for detection and prevention of hypo/hyperglycemia Every 6 to 12 months, patients should conduct a comparison of their meter result with lab measured BG level 59
  • 59. Frequency of SMBG 3 or more times daily for most patients who require insulin, At least 2 or 3 times per week for those not receiving insulin Whenever hypoglycemia or hyperglycemia is suspected; with changes in medications, activity, or diet; and with stress or illness 60
  • 60. Pharmacologic Therapy Insulin Therapy In type I diabetes, exogenous insulin must be given for life In type 2 diabetes, insulin may be necessary on a long- term basis to control BG if meal planning and oral agents are ineffective or when insulin deficiency occurs SMBG is a cornerstone of insulin therapy 61
  • 61. Preparations of insulin Based on the onset, peak, and duration of action Rapid-acting insulins More rapid effect and shorter duration of action Patient should eat within 5 to 15 minutes of injection Long-acting insulin (basal insulin) is required to maintain glucose control 62
  • 62. Preparations of insulin… Short-acting insulins called regular insulin (marked R on the bottle) Regular insulin is a clear solution and is usually given 20 to 30 minutes before a meal Can be given alone or with longer-acting insulin 63
  • 63. Preparations of insulin… Intermediate-acting insulins called NPH insulin (neutral protamine Hagedorn) or Lente insulin Appear milky and cloudy function as basal insulins but may have to be split into 2 injections to achieve 24-hour coverage. If NPH or Lente insulin is taken alone, it is not crucial that it be taken before a meal but patients should eat some food around its time of onset and peak 64
  • 64. Preparations of insulin… Very long-acting insulins (basal insulin) Absorbed very slowly over 24hrs and can be given once a day 65
  • 65. Preparations of insulin cont’d 66
  • 66. Insulin Regimens Conventional Regimen One or more injections of a mixture of short and intermediate-acting insulins per day  Τ 𝟐 𝟑 of total dose in the morning (with Τ 𝟐 𝟑 long-acting and Τ 𝟏 𝟑 short-acting insulin) and Τ 𝟏 𝟑 before the evening meal (with Τ 𝟏 𝟐 long-acting and Τ 𝟏 𝟐 short-acting) 67
  • 67. Conventional Regimen… Total insulin dose per day ─Initiation: 0.2 - 0.4 units/kg/day ─Maintenance: roughly 0.6 - 0.7 units/kg/day Regimen options commonly available in Ethiopian setting NPH twice daily (before breakfast and at bed time) and Regular insulin twice daily (before breakfast & before supper) Premixed insulin (70% NPH & 30% regular) twice daily: before breakfast and before supper NPH twice daily: before breakfast and before bedtime 68
  • 68. Intensive Regimen 3 or 4 injections of insulin per day allows the patient more flexibility to change the insulin doses from day to day Intensive insulin therapy requires: ─Monitoring BG before breakfast, before lunch, before dinner & before bed ─Adjusting insulin doses in response to given glucose patterns ─Coordinating diet, exercise, and insulin therapy 69
  • 69. Storing Insulin All insulin, including spare pens and vials not in use, should be refrigerated Insulin pen or vial in use should be kept at room temperature to reduce local irritation at injection site Insulin can be kept at room temperature for 1 month 70
  • 70. Preparing the Injection Mixing Insulins ─Regular and NPH insulins can be mixed together in the same syringe. ─NPH should be mixed carefully by rolling the vial gently. ─Regular insulin is drawn into syringe first, followed by NPH Premixed insulin in a vial or in a prefilled syringe can be used Premixed insulins: 70/30 (70% NPH and 30% regular insulin), 50/50 71
  • 71. Injection Site 72 Injection sites: ─abdomen, ─posterior surface of upper arms, ─anterior surface of the thighs ─flank area
  • 72. Injection Site… Use all available injection sites within one area rather than randomly rotating sites from area to area Or, always using the same area at the same time of day (E.g. Morning into abdomen, evening into arms) If patient plans to exercise, insulin should not be injected into the limb that will be exercised → faster absorption →hypoglycemia 73
  • 73. Insulin Injection Injection site is cleansed prior to insertion of needle To inject insulin, the skin is gently pinched and needle is inserted at 90-degree angle ─45-degree angle for patients with lower BMI Injection sites should be at least 1 inch apart Too deep or too shallow injection affects rate of absorption Note: Routine aspiration to assess blood is not necessary 74
  • 74. Insulin Injection… 75 Self-injection of Insulin 1. With one hand, stabilize the skin by spreading it or pinching up a large area 2. Pick up the syringe with the other hand and hold it as you would a pencil. Insert the needle straight into the skin 3. To inject the insulin, push in the plunger all the way 4. Pull the needle straight out of the skin. Press a cotton ball over the injection site for several seconds 5. Use a disposable syringe only once and discard it into a hard plastic container
  • 75. Oral Antidiabetic Agents 1. Biguanides 2. Sulfonylureas 3. Alpha-glucosidase inhibitors 4. Nonsulfonylurea insulin secretagogues (meglitinides and phenylalanine derivatives) 5. Thiazolidinediones (glitazones) 6. Dipeptidyl peptidase 4 (DPP-4) inhibitors 7. Glucagon-like peptide 1 (GLP-1) analogs 8. Sodium-glucose transporter 2 (SGLT-2) inhibitors 76
  • 76. Biguanides: Metformin Acts by decreasing hepatic production of glucose and improves peripheral glucose utilization Reduces fasting plasma glucose and insulin levels, and promotes modest weight loss As monotherapy and in combination with other oral agents or with insulin 77
  • 77. Sulfonylureas Stimulate the pancreas directly to secrete insulin A functioning pancreas is necessary  Improve insulin action at the cellular level and also may directly decrease hepatic glucose production Most common side effect is hypoglycemia Second-generation sulfonylureas (glipizide, glyburide, glimepiride) are safer 78
  • 78. Indications for insulin therapy in type 2 diabetes mellitus Failure to control blood glucose with oral medicines Temporary use for major stress, e.g. surgery, medical illness Severe kidney or liver failure Pregnancy HbA1C >10%, FPG >250 mg/dl, RBS consistently >300 mg/dl, or ketonuria When distinguishing type 1 from type 2 diabetes is difficult 82
  • 79. Doses and contraindications 83 Drug Dose Contraindications Metformin  500mg PO daily with meals  Titrate dose slowly based on BG levels or HbA1C to a maximum dose 2000-2500mg  Serum creatinine: >1.5 mg/dL (men), >1.4 mg/dL (women),  CHF, radiographic contrast studies, seriously ill patients, acidosis, hepatic failure Glibenclamide  2.5mg-5mg PO daily 30min before breakfast  Titrate dose slowly based on HbA1c and/or FBG levels to 15mg daily  When 7.5mg per day is needed, divide total daily dose into 2, with larger dose in the morning  Elderly and patients with renal impairment Glimepiride  1-2mg PO dailywith breakfast or the first main meal  Titrate dose slowly based on HbA1c and/or FBG levels  Maximum dose of 8mg once daily  Hypersensitivity to sulfonyl ureas or sulfonamides,  breast feeding  DKA
  • 80. Insulin initiation and dose increment in type-2 diabetes 84 Regimen Insulin type Starting dose Increment Alternative dosing Add on-to oral agent NPH 10 units before bedtime 2–4 units in 3-7 days Higher dose may be started in patients with severe hyperglycemia Substitutio n Therapy (Insulin substitutin g all oral agents) NPH 15 units • 10 units, 30min Before breakfast • 5 units, 30min before supper 4 units in 3-7 days Higher dose may be started in patients with severe hyperglycemia
  • 81. 85 Management of other cardiovascular risk factors Drug Dose Indications Aspirin  75–162mg PO daily  Increased cardiovascular risk (10-year risk >10%)  Men >50years or women >60years with at least one additional major risk factor (hypertension, smoking, dyslipidemia, albuminuria and family history of CVD) Statins  Simvastatin, 10-40mg PO daily  Atorvastatin 10- 40mg PO daily  Rosuvastatin 5-20mg PO daily  Lovastatin 20-80mg P O daily  Overt CVD  >40 years of age and have one or more other CVD risk factors  Without CVD and <40 years- if LDL cholesterol remains >100mg/dl or have multiple CVD risk factors,
  • 82. Sequential therapy in Type 2 Diabetes 86 Healthy eating, weight control, increased physical activity Metformin Two medicine therapies Glycemic targets not meet in 3 months Metformin + Sulfonylurea Metformin + Basal Insulin Three medicine therapies Metformin + Sulfonylurea + Basal Insulin Glycemic targets not meet in 3 months Glycemic targets not meet in 3-6 months Complex Insulin regimens i.e. Multiple insulin injections per day
  • 83. Education Provide the patient with basic knowledge and skills for diabetes management Include the following: ─Simple pathophysiology ─Treatment modalities ─Recognition, treatment, and prevention of acute complications Provide also the patient with detailed information to foster self- reliance and independence for diabetes management at home Educate on skills and information to improve lifestyle and individualization of diabetes self-management 87
  • 84. Glycemic Targets for Non-Pregnant Adults with Diabetes 88 Fasting plasma glucose (capillary) 70-130 mg/dl Postprandial (1–2 hrs after beginning of meal) plasma glucose < 180 mg/dl Haemoglobin A1C < 7%
  • 86. Acute complications of diabetes 1. Hypoglycemia (Insulin Reaction) 2. Diabetic ketoacidosis 3. Hyperglycemic hyperosmolar syndrome 90
  • 87. Hypoglycemia Blood glucose <70 mg/dL (3.9 mmol/L) It can cause serious morbidity; if severe it can be fatal Its incidence is lower in T2DM than in T1DM It often occurs before meals (if meals are delayed/omitted) Causes ─too much insulin or oral hypoglycemic agents, ─too little food, or ─ excessive physical activity 91
  • 88. Hypoglycemia… Hypoglycemia may be documented by Whipple’s triad: 1. Symptoms consistent with hypoglycemia 2. Low plasma glucose concentration measured with a precise method 3. Relief of symptoms after plasma glucose level is raised 92
  • 89. 93 Fig: Physiology of glucose counterregulation: Mechanisms that normally prevent or rapidly correct hypoglycemia
  • 90. 94
  • 91. Clinical Manifestations 2 categories of symptoms: ─Autonomic nervous system (ANS) symptoms ─Central nervous system (CNS) symptoms In mild hypoglycemia, ANS is stimulated ─Adrenergic symptoms: tachycardia, palpitations, tremor, and anxiety ─Cholinergic symptoms: sweating, hunger, and paresthesiae 95
  • 92. C/M…. In moderate hypoglycemia ─inability to concentrate, headache, lightheadedness, confusion, memory lapses, slurred speech, impaired coordination, emotional changes, irrational or combative behaviour In severe hypoglycemia, ─disoriented behavior, seizures, difficulty arousing from sleep, or loss of consciousness 96
  • 93. C/M… Hypoglycemia unawareness Caused by attenuated sympathoadrenal response to hypoglycemia Loss of warning adrenergic and cholinergic symptoms Occurs in some pts who have had diabetes for many years Affected pts must perform SMBG on frequent basis 97
  • 94. Management Giving carbohydrates (CHO) ─15 to 20 g of fast-acting concentrated source of glucose orally Sources of glucose for include: ─3 or 4 commercially prepared glucose tablets ─4 to 6 oz of fruit juice or regular soda ─6 to 10 hard candies ─2 to 3 teaspoons of sugar or honey 98
  • 95. Management… BG level should be retested in 15 minutes and retreated with another 15 g if the patient is still hypoglycemic. If symptoms persist for > 15minutes after initial treatment, treatment is repeated even if BG testing is not possible Once BG has come to normal, snack or meal containing protein and starch (e.g., milk or cheese) is recommended to prevent recurrent hypoglycemia 99
  • 96. Management… 25 to 50 mL D50W via IV push at a rate of 10 mL/min Glucagon 1 mg IV or SC can be administered if patient is unconscious or unable to swallow 100
  • 97. Diabetic Ketoacidosis (DKA) DKA is caused by absence or markedly inadequate amount of insulin 3 main clinical features of DKA are: ─Hyperglycemia ─Dehydration and electrolyte loss ─Acidosis 101
  • 98. DKA… Causes of DKA Insufficient or missed doses of insulin Physical or emotional stress Illness or infection Undiagnosed and untreated diabetes 102
  • 99. Pathophysiology Insulin deficiency → reduced amount of glucose entering the cells and increased hepatic glucose production and release → hyperglycemia Kidneys excrete excess glucose → osmotic diuresis → dehydration and electrolytes loss Hyperosmolality of blood → stimulation of thirst → polydipsia and fluid shifting from intracellular to extracellular space → low serum sodium level 103
  • 100. Pathophysiology… Insulin deficiency → breakdown of fat into free fatty acids → free fatty acids conversion into ketone bodies→metabolic acidosis Metabolic acidosis → respiratory system blows off CO2→rapid deep respirations (Kussmaul respirations) Ketones (volatile acid), as they are exhaled, they may manifest as acetone breath that has a fruity odor similar to overripe apples 104
  • 101. Clinical manifestations Polyuria, polydipsia, weakness, and malaise Blurred vision → due to osmotic changes to lens Orthostatic hypotension; warm, dry skin; decreased skin turgor; flat neck veins; and dry mucous membranes Weak, rapid pulse Anorexia, nausea, vomiting, and abdominal pain Acetone breath & Kussmaul respirations 105
  • 102. Diagnostic findings Blood glucose levels >250 mg/dL Low serum pH (6.8 to 7.3) Low serum bicarbonate (0 to 15 mEq/L) Urine glucose (usually >3+), Urine ketone (usually >2+) Abnormal levels of serum electrolytes (Na+, K+, and Cl-) Increased creatinine, BUN, and Hematocrit may be seen with dehydration Others: CBC, Blood and urine culture, Blood film, Chest X-ray 106
  • 103. Management of DKA Rehydration 2 to 3 L of IV fluid (0.9% NaCl solution) at 0.5 - 1L/hr for 1-3 hours, but the patient may need as much as 6 to 10 L Use 0.45% NaCl solution for pts with hypertension or hypernatremia Change IV solution to D5W when BG level becomes ≤250mg/dL 107
  • 104. Management of DKA… Reversing acidosis Administer short-acting regular insulin: 0.1 units/kg IV bolus, then 0.1 units/kg/hour or 5 units/hour by continuous IV infusion; increase 2 – 3 fold if no response by 2–4 h. If initial serum potassium is <3.3 mEq/L, do not administer insulin until it is corrected Even if BG levels are decreasing, insulin drip must not be stopped until SC insulin therapy has been started or until serum bicarbonate level ≥15 mEq/L and anion gap is ≤12 ─Instead, rate of D5W infusion can be increased 108
  • 105. Management of DKA… Restoring Electrolytes Monitor serum K+ levels carefully during Rx of DKA Insulin administration or rehydration will decrease serum K+ If initial serum potassium is >5.2 mEq/L, do not supplement K+ until it is corrected Give 10mEq/h when plasma K+ <5.0–5.2 meq/L (or 20–30 meq/L of infusion fluid), ECG normal, urine flow and normal creatinine documented Administer 40–80 meq/h when plasma K+ <3.5 meq/L or if bicarbonate is given If K+ determination is not possible delay initiation of K+ replacement until there is reasonable urine put(>50 ml/hr) 109
  • 106. Management of DKA… Assess patient for precipitating factors (noncompliance, infection, trauma, pregnancy, infarction, cocaine). Initiate appropriate investigation (cultures, CXR, ECG) Measure BG every 1–2 h; measure electrolytes (especially K+, bicarbonate, phosphate) and anion gap every 4 h for first 24 h Monitor blood pressure, pulse, respirations, mental status, fluid I&O every 1–4 h 110
  • 107. Management of DKA… Continue above Rx until patient is stable, glucose goal is 150–200 mg/dL, and acidosis is resolved. Insulin infusion may be decreased to 0.02–0.1 units/kg per hour. Administer long-acting insulin as soon as patient is eating Allow for a 2–4 hour overlap in insulin infusion and SC long-acting insulin injection Blood glucose usually improves at a rate of 50 to 100mg/dL/hr 111
  • 108. Management… Patient education about symptoms of DKA, its precipitating factors, and management of diabetes during concurrent illness During illness or when oral intake is compromised, pts should: ─Frequently measure capillary blood glucose ─Measure urinary ketones when serum glucose is >250 mg/dL ─Drink fluids to maintain hydration ─Continue or increase insulin ─Seek medical attention if dehydration, persistent vomiting, or uncontrolled hyperglycemia develop 112
  • 109. Hyperglycemic Hyperosmolar Syndrome (HHS)  HHS is a serious life-threatening condition characterized by hyperosmolality (≥350 mOsm/L) and hyperglycemia (≥600 mg/dL) with alterations in level of consciousness Results from relative insulin deficiency initiated by illness and inadequate fluid intake Hyperglycemia induces osmotic diuresis that leads to intravascular volume depletion, which is exacerbated by inadequate fluid replacement 113
  • 110. HHS cont’d HHS occurs most often in older people (b/n 50 & 70 yrs) with no known history of diabetes or who have type 2 diabetes Ketosis and acidosis is usually minimal or absent HHS often can be precipitated by: ─Infection, acute or chronic illness (e.g, pneumonia, sepsis) ─Stroke or dementia ─Medications that exacerbate hyperglycemia (e.g thiazides) ─Therapeutic procedures, such as surgery or dialysis 114
  • 111. Clinical Manifestations Hypotension, tachycardia, and altered mental status Profound dehydration (dry MM, poor skin turgor) Variable neurologic signs secondary to cerebral dehydration ─alteration of sensorium, seizures, hemiparesis Nausea, vomiting, abdominal pain, and Kussmaul respirations are absent 115
  • 112. Diagnostic findings Blood glucose, serum osmolality ─BG level is usually 600 to 1200 mg/dL ─Osmolality exceeds 350 mOsm/kg ABG analysis BUN, Electrolyte CBC 116
  • 113. Management of HHS Overall approach to treatment is similar to that of DKA Fluid replacement 1–3L of 0.9% NS over the first 2–3 h. If the serum sodium is >150 mEq/L, 0.45% saline should be used Change to D5W when BG decreases to 250 to 300 mg/dL After hemodynamic stability is achieved, give hypotonic fluids (0.45% saline initially, then D5W) over the next 1–2 days at rates of 200–300 mL/h 117
  • 114. Management of HHS… Insulin administration IV insulin bolus of 0.1 unit/kg followed by IV insulin at a constant infusion rate of 0.1 unit/kg/hr If BG does not fall, increase insulin infusion rate by two fold Insulin infusion should be continued until pt has resumed eating and can be transferred to SC insulin regimen Correction of electrolyte imbalances K+ repletion is usually necessary depending on serum K+ level 118
  • 115. 119
  • 117. Learning objectives At the end of this lesson, students will be able to: Define diabetes insipidus Describe etiologic factors of diabetes insipidus Explain clinical manifestations of diabetes insipidus Discuss management strategies of diabetes insipidus 121
  • 118. Diabetes insipidus (DI) DI is a disorder of posterior lobe of pituitary gland characterized by deficiency of ADH It is characterized by polydipsia and large volumes of dilute urine Types Neurogenic DI: results from destruction of posterior pituitary gland, resulting in lack of vasopressin Nephrogenic DI: results from drug-related damage to renal tubules, resulting in inability to conserve water Psychogenic DI: caused by excessive water intake 122
  • 119. Risk factors Head trauma, brain tumor Surgical ablation or irradiation of pituitary gland CNS infections Failure of renal tubules to respond to ADH ─Due to hypokalemia, hypercalcemia, and medications (e.g., lithium, demeclocycline) 123
  • 120. Clinical Manifestations Very dilute urine (3 to 20 L) with nocturia Frequency of urination Specific gravity of 1.001 to 1.005 Signs and symptoms of fluid volume deficit including: ─Weight loss ─Poor skin turgor ─Dry mucous membranes ─Hypotension, increased heart rate Patient tends to drink 2 to 20 L of fluid daily 124
  • 121. Diagnosis 24-hour urine collection to measure volume and creatinine Plasma levels of ADH (normal: 1.3-4.1pg/mL) Plasma and urine osmolality Fluid deprivation test Vasopressin challenge test ─Desmopressin is administered IV 125
  • 122. Medical Management Objectives ─To replace ADH (usually a long-term therapeutic program) ─To ensure adequate fluid replacement ─To identify and correct the underlying pathology Medications ─Desmopressin/DDAVP (synthetic vasopressin) ─Other: chlorpropamide, thiazide diuretics, and/or prostaglandin inhibitors (e.g., ibuprofen, indomethacin, and aspirin) 126
  • 123. Nursing management Educate patient, family, and other caregivers about follow-up care, prevention of complications, and emergency measures Instruct about dose, actions, side effects, & administration of all medications and signs and symptoms of hyponatremia Demonstrate and observe return demonstration of medication administration to ensure patient received prescribed dosage Advise to wear medical identification bracelet and carry required medication and information about DI at all times 127
  • 125. Learning objectives At the end of this lesson, students will be able to: Differentiate between hypothyroidism and hyperthyroidism Describe causes of hypothyroidism and hyperthyroidism Describe diagnostic methods used for hypothyroidism and hyperthyroidism Describe management of hypothyroidism and hyperthyroidism 129
  • 126. Hypothyroidism Results from suboptimal levels of thyroid hormone It can range from mild, subclinical forms to myxedema (severe deficiency) Primary or thyroidal hypothyroidism Central hypothyroidism ─Pituitary or secondary hypothyroidism ─Hypothalamic or tertiary hypothyroidism Neonatal hypothyroidism: present at birth 130
  • 127. Causes Autoimmune disease (Hashimoto thyroiditis) Iodine deficiency Therapy for hyperthyroidism ─Radioactive iodine, thyroidectomy ─Antithyroid medications Atrophy of thyroid gland with aging Radiation to head and neck 131
  • 128. Pathophysiology Decreased T4 leads to stimulation of TSH in the pituitary gland TSH stimulates secretion of T3 to increase production of T4, leading to hypertrophy of thyroid gland Laboratory findings ─Decreased T3 (normal: 260-480pg/dl) ─Decreased T4 (normal: 5.4-11.5mcg/dl) ─Increased TSH (normal: 0-15mIU/L) 132
  • 129. Clinical Manifestations Extreme fatigue, air loss, brittle nails, and dry and thick skin Numbness and tingling of the fingers Voice may become husky, and hoarseness Menorrhagia, amenorrhea, loss of libido Respiratory muscle weakness, Inadequate ventilation, and sleep apnea Elevated serum cholesterol, atherosclerosis, CAD, poor left ventricular function, and pericardial effusion 133
  • 130. Clinical Manifestations… Face becomes expressionless and masklike Subnormal body temperature and pulse rate Weight gain even without increase in food intake Irritability, fatigue, constipation, mental processes become dulled Speech is slow, tongue enlarges, hands and feet increase in size, and deafness 134
  • 131. Medical Management Objectives ─To restore normal metabolic state ─To prevent disease progression and complications Pharmacologic Therapy ─Synthetic levothyroxine (75 to 150 mcg per day) ─IV administration of T4 and T3 for myxedema coma until the patient is safe to take oral form 135
  • 132. Nursing Management Monitor patient’s vital signs and cognitive level closely Maintain vital functions, such as managing cardiopulmonary status, hyponatremia, and hypoglycemia Monitor blood glucose levels closely Take precautions during course of therapy because of interaction of thyroid hormones with other medications 136
  • 133. Hyperthyroidism It is the 2nd most prevalent endocrine disorder, after diabetes It results of overproduction of T3, T4, or both It is manifested by a greatly increased metabolic rate Usually oversecretion of T3 and T4 is associated with enlarged thyroid gland Most common causes: Graves disease, toxic multinodular goiter, and toxic adenoma 137
  • 134. Hyperthyroidism… Graves disease Autoimmune disorder resulting from excessive output of thyroid hormones caused by abnormal stimulation of thyroid gland Affects women eight times more frequently than men 138
  • 135. Clinical Manifestations Nervousness, emotionally hyperexcitable, irritable, and apprehensive Inability to sit quietly Heat intolerance, perspiration Skin appears flushed and feels warm, soft, and moist Increased appetite and dietary intake Weight loss, fatigability and weakness 139
  • 136. Clinical Manifestations… Ophthalmopathy (eg. Exophthalmo) Amenorrhea and changes in bowel function Palpitations, increased pulse Atrial fibrillation, sinus tachycardia or dysrhythmias, increased pulse pressure Myocardial hypertrophy and heart failure if left untreated 140
  • 137. Diagnosis P/E: thyroid gland is enlarged, feels soft, and may pulsate; often thrill can be palpated, and bruit is heard over thyroid arteries ─signs of increased blood flow through thyroid gland ECG ↓sed serum TSH, ↑sed T3 and T4, and ↑se in radioactive iodine uptake 141
  • 138. Management Aims: To reduce thyroid hyperactivity, relieve symptoms, and prevent complications Treatment consists of combination of radioactive iodine, antithyroid agents, and surgery Radioactive iodine 131 therapy ─Destroys the overactive thyroid cells ─Almost all body’s iodine are concentrated in thyroid gland 142
  • 139. Management… Antithyroid drugs Inhibits one or more stages in thyroid hormone synthesis or release Most commonly, propylthiouracil (PTU) or methimazole (Tapazole) is used until the patient is euthyroid. ─These medications block the conversion of T4 to T3 Adjunctive Therapy to antithyroid drugs Propranolol: to control nervousness, tachycardia, tremor, anxiety, and heat intolerance 143
  • 140. Management… Thyroidectomy Indications: pregnant women allergic to antithyroid drugs, patients with large goiters, or patients unable to take antithyroid drugs Performed soon after thyroid function has returned to normal (4 to 6 weeks) Surgical removal of about five sixths of thyroid tissue (subtotal thyroidectomy) reliably results in a prolonged remission in most patients with exophthalmic goiter 144
  • 141. 145
  • 143. Learning objectives At the end of this lesson, students will be able to: Differentiate between hypoparathyroidism and hyperparathyroidism Describe causes of hypothyroidism and hyperthyroidism Describe diagnostic methods used for hypoparathyroidism and hyperparathyroidism Describe management of hypoparathyroidism and hyperparathyroidism 147
  • 144. Hyperparathyroidism It is caused by overproduction of parathormone It is characterized by bone decalcification and development of renal stone Primary hyperparathyroidism It occurs 2 to 4 times more often in women than in men It is most common b/n 60 and 70 years of age 148
  • 145. Hyperparathyroidism Secondary hyperparathyroidism It occurs in patients who have chronic kidney failure and so-called renal rickets as a result of phosphorus retention, increased stimulation of parathyroid glands, and increased parathormone secretion 149
  • 146. Clinical Manifestations Patient may have no symptoms or may experience signs and symptoms Apathy, fatigue, muscle weakness, nausea, vomiting, constipation, hypertension, and cardiac dysrhythmias Irritability, neurosis, psychoses caused by the direct action of calcium on the brain and nervous system Decrease in excitation potential of nerve and muscle tissue 150
  • 147. Clinical Manifestations… Nephrolithiasis, pyelonephritis, and kidney injury Skeletal pain and tenderness Pain on weight bearin Pathologic fractures Deformities, shortening of body stature Peptic ulcer and pancreatitis 151
  • 148. Diagnosis Elevation of serum Ca++ levels and parathormone Radioimmunoassays for parathormone Bone changes may be detected on x-ray or bone scans Double-antibody parathyroid hormone test is used to distinguish between primary hyperparathyroidism and malignancy Ultrasound, MRI, thallium scan,and fine-needle biopsy 152
  • 149. Management Parathyroidectomy: surgical removal of abnormal tissue Daily fluid intake of 2,000 mL or more to prevent renal stone formation Thiazide diuretics are avoided Patient is advised to avoid a diet with calcium Monitor the patient to detect symptoms of tetany closely 153
  • 150. Hypoparathyroidism It results from hyposecretion of parathyroid glands, Leads to low levels of PTH that eventually results in hypocalcemia and hyperphosphatemia The most common cause is surgical removal of parathyroid gland tissue during thyroidectomy, parathyroidectomy, or radical neck dissection 154
  • 151. Hypoparathyroidism… In the absence of parathormone, there is decreased intestinal absorption of dietary calcium and decreased resorption of calcium from bone and through renal tubules Decreased renal excretion of phosphate causes hypophosphaturia, and low serum calcium levels result in hypocalciuria 155
  • 152. Clinical Manifestations Irritability of neuromuscular system and tetany Symptoms of latent tetany: numbness, tingling, and cramps in extremities, and stiffness in the hands and feet Signs of overt tetany: bronchospasm, laryngeal spasm, carpopedal spasm (flexion of the elbows and wrists and extension of the carpophalangeal joints and dorsiflexion of the feet), dysphagia, photophobia, cardiac dysrhythmias, and seizures Anxiety, irritability, depression, delirium ECG changes and hypotension 156
  • 153. Diagnostic Findings Positive Chvostek sign or a positive Trousseau sign suggests latent tetany Chvostek sign is positive when sharp tapping over the facial nerve just in front of parotid gland and anterior to ear causes spasm or twitching of mouth, nose, and eye Trousseau sign is positive when carpopedal spasm is induced by occluding the blood flow to arm for 3 minutes with a blood pressure cuff Serum calcium & phosphate levels, x-rays of bone 157
  • 154. Medical Management Administer 10% calcium gluconate intravenously If this does not decrease neuromuscular irritability and seizure activity immediately, sedative agents, such as pentobarbital, may be administered. Parenteral PTH to treat acute hypoparathyroidism with tetany Diet high in calcium and low in phosphorus 158
  • 155. Medical Management… Aluminum hydroxide gel or aluminum carbonate may be used after meals to bind phosphate and promote its excretion through the GI tract Vitamin D ─Dihydrotachysterol, ergocalciferol, or cholecalciferol ─Enhances calcium absorption from the GI tract 159
  • 156. Nursing Management Keep calcium gluconate at the bedside in a locked container or in a place where it is readily available along with equipment necessary for IV administration. Continuous cardiac monitoring and careful assessment Educate patient about medications and diet therapy Teach patient to contact the primary care provider if these symptoms occur 160
  • 158. Learning objectives At the end of this lesson, students will be able to: Define Cushing syndrome Describe causes of Cushing syndrome Describe management Cushing syndrome Describe diagnostic methods used for Cushing syndrome 162
  • 159. Cushing syndrome It is a rare disorder characterized by high levels of serum cortisol 3 causes of Cushing syndrome: Pituitary tumor that overproduces ACTH Adrenal tumor that overproduces ACTH Long-term glucocorticoid therapy 163
  • 160. Cushing syndrome… It more frequently affects women, Ectopic ACTH syndrome is more frequently identified in men Only 10% of patients with Cushing’s syndrome have primary, adrenal cause Use of glucocorticoids is the most common cause 164
  • 161. Clinical Manifestations C/Ms are primarily due to oversecretion of glucocorticoids and androgens Upregulation of gluconeogenesis, lipolysis, and protein catabolism Arrest of height, hypertension, hirsutism, and depression Thin, fragile, and easily traumatized skin Ecchymoses, purple striae 165
  • 162. Clinical Manifestations… Muscle weakness, wasting, and thin extremities Increased susceptibility to infection Slow healing of minor cuts Disturbed sleep Osteoporosis, kyphosis, backache, and compression fractures of vertebrae 166
  • 163. Clinical Manifestations… Altered fat metabolism results in a classic picture of Cushing syndrome in the adult: ─Central obesity ─Protruding abdomen ─Fatty “buffalo hump” in the neck and supraclavicular areas ─ “moon-faced” appearance 167
  • 165. Clinical Manifest…cont’d Virilization in females ─Hirsutism, breasts atrophy, menses cease, clitoris enlarges, and voice deepens Libido is lost in men and women 169
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  • 167. 171
  • 168. Diagnosis Serum cortisol Urinary cortisol Low-dose dexamethasone suppression tests ─1 mg of dexamethasone is administered orally at 11:00 PM, and plasma cortisol level is obtained at 8:00 AM the next morning ─Suppression of cortisol to <5mg/dL indicates hypothalamic– pituitary–adrenal axis is functioning properly CT, ultrasound, or MRI is performed to localize adrenal tissue and detect tumors of adrenal gland 172
  • 169. Management If cause is pituitary tumors, ─surgical removal of tumor by transsphenoidal hypophysectomy ─Radiation of the pituitary gland Adrenalectomy in patients with unilateral primary adrenal hypertrophy Medical management for bilateral adrenal dysplasia 173
  • 170. Management… Temporary replacement therapy with hydrocortisone may be necessary for several months, until the adrenal glands begin to respond normally to the body’s needs. Lifetime replacement of adrenal cortex hormones if bilateral adrenalectomy is performed 174
  • 171. Management… If cause is ectopic ACTH secretion ─Adrenal enzyme inhibitors to reduce hyperadrenalism ─Metyrapone, aminoglutethimide, mitotane, and ketoconazole If cause is administration of corticosteroids ─Reduce or taper medication to the minimum dosage ─Alternate-day therapy decreases the symptoms of Cushing syndrome and allows recovery of the adrenal glands’ responsiveness to ACTH 175
  • 172. Nursing Management Establish a protective environment to prevent falls, fractures, and other injuries to bones and soft tissues Encourage foods high in protein, calcium, and vitamin D to minimize muscle wasting and osteoporosis. Assess pt frequently for subtle signs of infection because anti- inflammatory effects of corticosteroids may mask the common signs of inflammation and infection. Assess skin and bony prominences frequently and encourage and assist pt to change positions frequently to prevent skin breakdown 176
  • 173. Reading assignment Iodine deficiency related goiter Thyroiditis (acute and chronic) Thyroid Cancer Addison’s diseases 177