A patient has a history of recurrent gum bleeding since childhood. While platelet counts and coagulation tests are normal, an inherited platelet disorder is suspected. The doctor's diagnostic approach would include a detailed bleeding history, physical exam looking for bruises/petechiae, and first-line screening tests like a bleeding time and platelet function analyzer. Further specific tests may include light transmission aggregometry to assess platelet aggregation in response to various agonists and help identify potential defects in adhesion, activation, secretion or aggregation. Interpreting the different waveforms is important to determine abnormalities consistent with disorders like Glanzmann's thrombasthenia or storage pool disease.
UAEU - CMHS - Hematology-Oncology Course - MMH 302 - HONC 320. Education material for medical students - It cover basic principles of hematology and oncology, including CAR-T and gene editing. It can be used for study and review. It illustrates main principles of hematology and oncology.
cytochemical stains. CML versus Leukamoid. LAP score. NAP score. Hematology, Hematopathology. Lab technology. Pahology. Medical Laboratory. White cell stains
UAEU - CMHS - Hematology-Oncology Course - MMH 302 - HONC 320. Education material for medical students - It cover basic principles of hematology and oncology, including CAR-T and gene editing. It can be used for study and review. It illustrates main principles of hematology and oncology.
cytochemical stains. CML versus Leukamoid. LAP score. NAP score. Hematology, Hematopathology. Lab technology. Pahology. Medical Laboratory. White cell stains
Thrombocytopenia is most frequently encountered Hematological problem in hospitalized patients. The most common causes and differential diagnosis of In-patient and Outpatient presentations of Thrombocytopenia is discussed here. Useful for Internal Medicine Boards . Archer Internal Medicine Board review lectures will be released soon.
HEMOSTASIS /stages of hemostasis / Formation of platelet plug/ Mechanism of b...Bharath S R
Vasoconstriction, the platelet cell membrane, the formation of a platelet plug, and the significance of the platelet mechanism for sealing vascular holes. PHARMACOLOGICAL AGENTS, INTERACTION BETWEEN THE INTRINSIC AND EXTRINSIC PATHWAYS, BLOOD CLOT, AND THE MECHANISM OF BLOOD COAGULATION
Hemostasis, Coagulation, Intrinsic, Extrinsic & common Pathways of Clotting, Common bleeding disorders & their investigations, BT, CT, PT, APTT, TT, Blood & its products, Blood transfusion & its complication.
Investigation of bleeding disorder || bleeding disorderparveen singh
this is a topic on investigation of bleeding disorder.
This may result from:
1 Vascular disorders
a] Thrombocytopenia
2Platelet Disorder
b] Defective platelet function
3Defective coagulation
4Defective Fibrinolysis
it is due to
-Inherited bleeding disorders
-Acquired bleeding disorders
investigation include:
first line test {basic test daily done in coagulation lab}
second line test {some important test done whenever all first line investigation test are normal }
Main Credit Goes To__-----___--- nitin dudeja {senior}
Coagulation: In medicine, the clotting of blood. The process by which the blood clots to form solid masses, or clots.
More than 30 types of cells and substances in blood affect clotting. The process is initiated by blood platelets. Platelets produce a substance that combines with calcium ions in the blood to form thromboplastin, which in turn converts the protein prothrombin into thrombin in a complex series of reactions. Thrombin, a proteolytic enzyme, converts fibrinogen, a protein substance, into fibrin, an insoluble protein that forms an intricate network of minute threadlike structures called fibrils and causes the blood plasma to gel. The blood cells and plasma are enmeshed in the network of fibrils to form the clot.
In this presentation one can find the following content
- structure of platelet
-definition of anti-platelet drugs
-classification of anti-platelet drugs
-guidelines for anti-platelets drugs.
Physiology of coagulation.
Coagulation disorders, evaluation, treatment and anaesthetic implications.
Thromboelastography and its relevance to Liver transplant and anaesthetic management of the same. Complete with TEG images of liver transplant patients at various phases of the surgery
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Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
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Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
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- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
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Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
2. A patient with recurrent episodes of gum
bleed since childhood is referred to you
Platelet counts and coagulation profile is
normal. suspecting an inherited disorder.
What will be your diagnostic approach?
Explain the rationale.
3. Give under lying defects of two major
inherited platelet function disorders
What is the principle of platelet function
test
How will you interpret its different wave
forms Pitfalls of the technique
4. Detailed history of the patient
bleeding from any other site besides gum
bleeding pts with platelet dysfunction may
have history of epistaxis and if female
menorrhagia
Excessive bleeding in response to major
nicks is suggestive of platelet dysfunction and
VWD
Ask about fatique, tiredness the bleeders
usually suffer from anaemia due to chronic
blood loss
5. Assess the extent of haemorrhages
against the background of trauma
Past history of bleeding during hemostatic
challenge tooth extraction
surgery, trauma, child birth
6. Obtaining objective confirmation of the
subjectivei nformation conveyed in the
bleeding history is valuable.
Objective data include
• Previous hospital or physician visits for bleeding
symptoms,
• Results of previous laboratory evaluations,
• Previous transfusions of blood products for bleeding
episodes, and
• A history of anemia and/or previous treatment with
iron.
7. Drug history
esp non- prescription drugs
Herbal medicines poses particular
problems
patients do not readily share
active ingredient difficult to determine
Ginkgo biloba and ginseng can cause
platelet dysfunction
Ask about dietary supplements
8. A detailed family history draw pedigree for
at least two generations, inherited platelet
disorders are autosomal recessive in
inheritance
History of consanguineous marriage,
consanguineous marriages are more
chances of expressing autosomal
recessive disorders
11. Assessing platelet number and size [MPV]
Assessing platelet morphology – blood film
Screening tests of platelet function Bleeding Time [BT] and PFA-
100
Light Transmission Aggregometry e.g. classical Born
aggregometry
Flow cytometry e.g. to quantitate the presence or absence of
platelet membrane glycoproteins
measurement of platelet nucleotides [ADP, ATP and the ADP:ATP
ratio]
Electron microscopy to look for the presence or absence of
platelet granules
Flow analysis to look for platelet granules [mepacrine binding]
Lumiaggregometry to look at platelet granule release.
12. Screening test for the presence of platelet
function defect
Patients with functional defects of platelets
can show BTs in excess of 20 minutes
With platelet counts greater than
100,000/ul the BT should be less than 08
minutes
13. A complete blood count (CBC) with
examination of the blood film can also be
helpful
Platelet morphology can help in diagnosing
disorders as bernard soulier syndrome
gray platelet syndrome
14. Direct measurements of platelet
activation/aggregation are possible using an
aggregometer or flow cytometer.
The aggregometer provides a graphic display
of the wave of platelet aggregation in
response to agonists such as ADP,
epinephrine or collagen and the agglutination
response to ristocetin
Specific functional defects respond differently
to these agonists.
15.
16.
17. Platelets have a complex ultrastructure
comprising a multitude of molecules and
the malfunctioning of any of these may
give rise to a specific disease .
18. Platelets participate in haemostasis by adhering to
exposed elements of the subendothelial matrix.
They then spread onto the subendothelial surface,
become activated, release the contents of their
storage organelles, and aggregate to each other.
Abnormalities in any of these stages – adhesion,
activation, secretion and aggregation
– may give rise to congenital disorders of platelets.
Patients
suffering from any of these diseases usually show
a bleeding diathesis with a prolonged bleeding
time and a normal platelet count.
21. The platelets contain defective or low levels of glycoprotein
IIb/IIIa (GpIIb/IIIa), which is a receptor for fibrinogen.
As a result, no fibrinogen bridging of platelets to other
platelets can occur,
(GpIIb/IIIa), also known as αIIbβ3, which is an integrin
aggregation receptor on platelets.
This receptor is activated when the platelet is stimulated by
ADP, epinephrine, collagen, or thrombin.
GpIIb/IIIa is essential to blood coagulation since the activated
receptor has the ability to bind fibrinogen (as well as von
Willebrand factor, fibronectin, and vitronectin), which is
required for fibrinogen-dependent platelet-platelet interaction
(aggregation)
22.
23. Platelet aggregation may be defined as the
interaction of activated platelets with one
another and occurs after adhesion of
platelets to the wall of the injured blood
vessel.
A series of factors are capable of inducing
platelet aggregation and may be classified
as primary and secondary platelet -
aggregating agents.
24. Primary aggregating agents are those
factors, such as ADP, adrenaline and
thrombin, able to directly induce platelet
aggregation independently of their ability to
release intraplatelet ADP or to induce the
production of prostaglandins.
25. Mutations within the genes that code for α
IIb β3 subunits have been described in GT
patients.
26. Type I GT is characterized by the lack of surface -
detectable α I Ib β3 complex and a profound defect
in platelet aggregation and clot retraction
Platelets of patients suffering from type II GT have
detectable, but mark-edly reduced, amounts of the
αI Ib β 3 receptor on their surface, usually 10 –
20% of normal values
a series of patients with a variant form have been
described who present near - normal levels of the
αI Ib β 3 complex, which is dysfunctional in that
platelets, when activated, can neither aggregate
nor bind fibrinogen
27. With a Storage Pool Disease (SPD), there may not be enough
of a certain type of granule, the granule may be abnormal, or
there may not be enough of the chemicals it is supposed to
hold.
In Delta Storage Pool Disease, the delta granules (also called
dense granules) are affected.
In Alpha Storage Pool Disease, it is the alpha granules. Alpha
SPD is also called Gray Platelet Syndrome. This is because
the platelets of someone with Alpha SPD look gray when
viewed under a microscope.
It is possible to have Alpha/Delta SPD in which both types of
granules are affected.
When platelets are not able to store chemicals or secrete
them when needed, they can’t let other platelets know to come
and help form a plug. It takes longer for a clot to form. SPD
usually results in mild to moderate bleeding symptoms.
28.
29. Defects of secondary a ggregation
Secondary aggregation disorders are more
frequent than
primary aggregation disorders and the most
common in this
category are the storage pool defi ciency
(SPD) syndromes. SPD
syndromes may be classifi ed in a system
that takes into account
the content of both dense and α granules
30. The disorder is heterogeneous and the term
SPD includes a group of disorders having as their common
feature a diminution in secretable substances stored in
platelet
granules.
A storage pool disease
Patients with δ – SPD or α δ - SPD usually have absent
ADP - and adrenaline- induced
secondary aggregation waves, although the primary waves
are
Present Collagen - induced aggregation is absent or
markedly reduced, whereas ristocetin - induced
agglutination is
normal.
31. The light absorbance of PRP decreases as
platelets aggregate.
The amount and the rate of fall are dependent
on platelet reactivity to the added agonist
provided that other variables, such as
temperature, platelet count and mixing speed,
are controlled.
The absorbance changes are monitored on a
chart recorder.
32. Light transmission aggregometry (LTA) is
regarded as the gold standard of platelet
function testing and is still the most used test
for the identification and diagnosis of platelet
function defects.
Platelet rich plasma (PRP) is stirred within a
cuvette located between a light source and a
detector. After addition of a various panel of
agonists, such as collagen, ADP, thrombin,
ristocetin, epinephrine, and arachidonic acid,
the platelets aggregate and light transmission
increases.
33. The platelet aggregation pattern is thought as
a primary response to an exogenous agonist,
followed by a secondary response to the
release of dense granule contents. This
biphasic response can be masked if high
concentrations of agonists are added.
Parameters measured include the rate or
slope of aggregation (%/min) and the
maximal amplitude (%) or percentage of
aggregation after a fixed period of time,
usually 6–10 min
34. Platelet aggregation is studied by means of a
platelet aggregometer, Used Principle:
1. Photo-optical Method
2. luminescence technology (Platelet
Lumiaggregometry)
3. Electrical Impedance Method
35.
36.
37.
38.
39. Arachidonic acid: used to assess the viability of the thromboxane
pathway.
Thrombin: reacts with several membrane sites to induce full
aggregation and secretion of organelle contents independent of the
prostaglandin or ADP pathways.
ADP: binds to a specific platelet membrane receptor and causes
platelet activation and release of dense granule stored ADP. Shows
biphasic aggregation.
Epinephrine: binds to specific receptor and causes ADP secretion, but
does not cause aggregation in storage pool disorder or release defects.
Collagen: Shows no primary wave of aggregation and depends on
intact membrane receptors, membrane phospholipase pathway
integrity and normal cyclooxygenase and thromboxane pathway
function.
Ristocetin: requires vWF and intact surface membrane including a
functional vWF receptor site (GPIb).
40.
41. Primary Response
Primary response is the reversible aggregation of platelets
by the aggregating agent. The appearance of a biphasic
reaction, showing both primary and secondary response,
can occur for some agonists at low concentrations
Secondary response is the result of enhancement of the
initial aggregation process caused by the release of
endogenous ADP and the formation of thromboxane A2.
the secondary response
Parameters measured include the rate or slope of
aggregation (%/min) and the maximal amplitude (%) or
percentage of aggregation after a fixed period of time,
usually 6–10 min
is irreversible.
42.
43.
44. The most obvious abnormalities in this series of aggregation
traces is a lack of aggregation to all agonists except ristocetin
There are two possible explanations:
1. Glanzmann's Thrombasthenia [GTT] in which there is a
defect in the GpIIb/IIIa receptorby lack of or reduction in platelet
aggregation to all agonists because fibrinogen cannot bind to
produce a platelet aggregate.
Platelet responses to ristocetin and vWF are normal, and platelet
secretion to collagen and thrombin remains existent, although at
a reduced level because there is no additional burst in secretion
resulting from platelet aggregation.
2. Afibrinogenaemia.
45.
46. These aggregation traces are essentially the
inverse of those seen in Q1. That is aggregation to
all agonists except ristocetin. This suggests that
the problem lies with the GpIb receptor.
Remember the GpIb receptor is involved in the
binding of Von Willebrand factor and therefore this
pattern of traces would suggest either Bernard
Soulier Syndrome [BSS] or VWD [probably severe
Type 1 or Type 3.]
The binding of platelets to VWF via the GpIb
receptor is critical for the binding of binding of
platelets to the damaged vascular endothelium.
47.
48. The obvious abnormalities in these series
of aggregation traces are the lack of
second wave aggregation with ADP and
adrenaline [remember these are weak
agonists] but in addition the aggregation
with collagen and ristocetin is abnormal
[reduced.]
This suggests either a platelet storage pool
disorder or an abnormality of platelet
granule release.
50. ADP
• reversible 1o wave
• if ADP is released, then 2o wave
• abnormal with aggregation and release problems
Epinephrin
• similar to ADP
Collagen
• direct release so only one wave of aggregation
Ristocetin
• antibiotic
• aggregation only with vWF and GP-Ib
51. Platelet function tests are still labor
intensive and time-consuming and require
special equipment and experts of
specialized laboratories.
A review of recent and regular medications
is also required
52. The main disadvantage of platelet function studies
is the use of PRP instead of the whole blood under
relatively low shear conditions, and, in the absence
of red and white cells, it does not accurately
simulate primary hemostasis.
It also requires large sample volume and is time-
consuming and there are many preanalytical and
analytical variables that affect the LTA results.
The LTA technique is not standardized, despite the
fact that guidelines have been published.
53. There are many preanalytical and analytical
variables that affect the LTA results
Sample quality is critical
Fibrinogen levels are important
Agonists must be prepared fresh daily
Thrombocytopenia makes result
interpretation difficult
Complete patient history is essential