The document discusses various types and causes of diarrhea including secretory, osmotic, inflammatory, steatorrhea, factitial, dysmotile, and iatrogenic causes. It provides details on evaluating diarrhea based on characteristics like stool appearance and volume, presence of blood or mucus, abdominal pain location, and related symptoms. Key tests mentioned for diagnosing the cause of diarrhea include stool studies for occult blood, white blood cells, pH, fat content, cultures, and electrolytes.
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http://sandymillin.wordpress.com/iateflwebinar2024
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2. DIARRHEA: is defined as passage of abnormally liquid or
unformed stool at an increased frequency. For adult on
typical western diet, stool wt>200g/d can be considered
diarrhea.
PSEUDODIARRHEA: frequent passage of small vol. of
stool,is often asso. With rectal urgency and a/c IBS or
proctitis.
FECAL INCONTINENCE: is involuntary passage of rectal
contents and is most often caused by neuromuscular
disorders or structural anorectal problems
Pseudodiarrhea and fecal incontinence occur at prevalence
rate comparable to or higher than that of chr. Diarrhea and
should always be considered in pt. complaining of diarrhea.
2
7. Due to derangement in fluid and
electrolyte transport across the
enterocolonic mucosa.
CLUE:Watery,Large volume ( >1
L/d),painless, little change with fasting;
normal stool osmotic gap
1.Medications
2. Bowel resection,mucosal
disease,enterocolic fistula).
3. Hormonally mediated (uncommon)
4.Congen.defect in ion absorption:
7
8. When ingested,poorly
absorbable,osmotically active solute
draw enough fluid into lumen to exceed
the reabsorptive capacity of the colon.
CLUES: Stool volume decreases with
fasting; increased stool osmotic
gap(>50mosmol/l).
1 magnesium (antacids, laxatives)
2. Medications
3 Disaccharidase deficiency
8
9. As stool leaves the colon, fecal osmolality is equal to
the serum osmolality, ie, approximately 290
mosm/kg. Under normal circumstances, the major
osmoles are Na+, K+, Cl–, and HCO3–. The stool
osmolality may be estimated by multiplying the stool
(Na+ + K+) × 2 (multiplied by 2 to account for the
anions)
The osmotic gap is the difference between the
measured osmolality of the stool (or serum) and the
estimated stool osmolality and is normally less than
50 mosm/kg
An increased osmotic gap implies that the diarrhea is
caused by ingestion or malabsorption of an
osmotically active substance
9
10. >7g/d fat in stool(Small intestine
disease15-25g/d,pancriatic exocrine
def.>32g/d).
CLUE:greasy ,Foul smelling,difficult
to flush,as/o with wt. loss
,nutritional def.(amino a,vitamins).
Intraluminal maldigestion
Mucosal malabsorption
Postmucosal lymphatic obstruction
10
13. Abnormal intestinal motility secondary to systemic
disorders or surgery may result in diarrhea due to
rapid transit or to stasis of intestinal contents
with bacterial overgrowth resulting in
malabsorption
Stool feature suggestive of secretory
diarrhea,mild steatorrhea may be there.
Hyperthyroidism, diabetic diarrhea ,carcinoid
syndrome.
medications(PGs ,prokinetic drugs).
Irritable bowel syndrome.
13
14. Approximately 15% of patients with
chronic diarrhea have factitial
diarrhea caused by surreptitious
laxative abuse or factitious dilution of
stool.
Munchausen syndrome(self inj. For
secondary gain,women),eating
disorder.
Hypotension,hypokalamia.
Psy. conselling beneficial. 14
23.
SMALL BOWEL DIARRHEASMALL BOWEL DIARRHEA LARGE BOWEL DIARRHEALARGE BOWEL DIARRHEA
Large stool volumeLarge stool volume Small amount of stoolSmall amount of stool
Increased frequency with largeIncreased frequency with large
volume stoolvolume stool
Increased frequency withIncreased frequency with
small volume stoolsmall volume stool
No urgencyNo urgency urgencyurgency
No tenesmusNo tenesmus Tenesmus presentTenesmus present
No mucusNo mucus Mucus in stoolMucus in stool
No bloodNo blood Blood may be presentBlood may be present
Central abdominal painCentral abdominal pain Pain in left iliac fossa relivedPain in left iliac fossa relived
by defecationby defecation
23
24. drug induced diarrhea
Food borne illness
waterborne illness
High fructose corn syrup
Excessive sorbitol or mannitol
Excessive coffee or other caffeine
24
25. Childhood diarrhea-resolves-re-emergence in
adulthood– celiac disease
Uncontrolled diabetes
Pelvic radiotherapy
PAST SURGICAL HISTORY
Jejunoileal bypass
Gastrectomy with vagotomy
Bowel resection
Cholecystectomy
25
26. Painless diarrhea
Recent onset in an older patient
Nocturnal diarrhea (especially if wakes
patient)
Weight loss
Blood in stool
Large stool volumes: >400 grams stool per
day
Anemia
Hypoalbuminemia
increased ESR
26
34. 24-hour stool collection for weight and quantitative
fecal fat–A stool wt. of > 300 g/24 h confirms the
presence of diarrhea, justifying further workup. A
wt. >1000–1500 g suggests a secretory process. A
fecal fat > 10 g/24 h indicates a malabsorptive
process
Categorize diarrhea into watery, inflammatory, fatty
Timed collection is best, spot tests on random stool
sample more practical
- Occult blood
- White blood cells
- pH
- Sudan stain for fat
- Cultures
- Laxative screen
- Electrolytes, osmolality
34
35. Occult blood and white blood cells:
- Primarily define inflammatory diarrhea
- Wright stain: Sensitivity 70%, specificity 50% for leukocytes
- Fecal calprotectin and lactoferrin less operator dependent
pH:
- Low pH (< 6) generally indicative of carbohydrate malabsorption
Sudan stain:
- Fatty diarrhea (steatorrhea)
- Gold standard: Quantitative estimation of stool fat on collected
specimen
- Qualitative estimation feasible on random sample,
- Semiquantitative methods (number and size of fat globules)
correlate well with quantitative collection
35
36. Stool cultures:
- Infection: Usually inflammatory diarrhea
- Bacterial infection rarely cause of chronic diarrhea in
immunocompetent host - Routine cultures are low yield
- Special techniques for Aeromonas and Plesiomonas
- Ova and Parasites
- Always consider giardiasis (stool ELISA for Giardia
antigen)
Laxative screen:
- High index of suspicion
- Stool for bisacodyl and phenolphtalein, urine for
anthraquinones
- Confirm on another sample before confronting patient
36
37. Stool electrolytes:
Stool osmotic gap: 290 – 2([Na+] + [K+])
- Gap < 50 mOsm/Kg: Pure secretory diarrhea
- Gap > 125 mOsm/Kg: Pure osmotic diarrhea
- Gap 50-125 mOsm/kg: Mixed or mild carbohydrate
malabsorption
Measured stool osmolality:
- Not used to calculate gap
- Useful in cases of unexplained diarrhea
- Low measured stool osmolality (< 290 mOsm/Kg)
suggestive of contamination with water or dilute urine
37
38. Fecal fat (abnormal if >10 grams/24 hours)
Stool ova and parasites (2-3 samples)
Giardia lamblia antigen
Indicated for diarrhea >7 days and >10 stools/day
Clostridium difficle toxin
Indicated if recent antibiotics or hospitalization
Consider testing stools for laxative abuse
38
40. Routine laboratory tests–CBC, serum electrolytes,
liver function tests, ca++, phosphorus, albumin,
TSH, total T4, and prothrombin time should be
obtained.
Anemia occurs in malabsorption syndromes (vitamin
B12, folate, iron) and inflammatory conditions.
Hypoalbuminemia is present in malabsorption,
protein-losing enteropathies, and inflammatory
diseases.
Hyponatremia and non–anion gap metabolic acidosis
may occur in profound secretory diarrheas.
Malabsorption of fat-soluble vitamins may result in
an abnormal prothrombin time, low serum calcium,
low carotene, or abnormal serum alkaline
phosphatase
40
42. Calcification on a plain abdominal radiograph
confirms the diagnosis of chronic pancreatitis.
An upper gastrointestinal series or enteroclysis
study is helpful in evaluating Crohn's disease,
lymphoma, or carcinoid syndrome.
Colonoscopy is helpful in evaluating colonic
inflammation due to IBD.
Upper endoscopy malabsorption due to mucosal
diseases. with a duodenal aspirate and small bowel
biopsy is also useful in patients with AIDS and to
document Cryptosporidium, Microsporida, and M
avium-intracellulare infection.
Abdominal CT is helpful to detect chronic
pancreatitis or pancreatic endocrine tumors.
42
44. Low Hb,Alb,abnormal MCV,MCH; excess
fat in stool
Opioid Rx + follow up
Persistent chronic
diarrhea
Titrate Rx to speed of
transit
Colonoscopy +
Biopsy
Small bowel:X
ray,biopsy,aspir
ate;stool 48-h
fat
Stool
vol,OSM,PH;L
axative
screen;Hormo
nal screen
Stool fat >20g/d
Pancreatic
function
Normal and
stool fat
<14g/d Full gut transit
Chronic diarrhea
Screening test all
normal
Low
k+
44
46. Treatment depend upon specific etiology
Curative ,suppressive or empirical.
CURATIVE:recetion of colorectal ca.,antibiotic for
whipple dis.,drug discontinuation of a drug.
SUPPRESSIVE:(supress the underlying mechanism)
Lactose avoid in lactase def.
Gluten diet for celiac sprue.
Glucocorticoids and anti inflammatory for IBD
PPI for gastrinoma
Cholestyramine for ileal bile acid malabsorbtion
Octreotide for malignent carcinoid syndrome
Prostaglandin (-) indomethacin:medullary ca thyroid
Pancreatic replacement:pancreatic insufficiency
46
47. EMPERICAL:mild to mod. Watery
diarrhea(diphenoxylate,loperamide),se
vere(codeine,opium)
Avoid in IBD as toxic megacolon ppt.
Clonidine:diabetic diarrhea
Fluid and electrolyte
Fat soluble vitamin
47
48. Drug Class Agent Dose
Opiates Diphenoxylate
Loperamide
Codeine
Morphine
Tincture of opium
2.5-5 mg QID
2-4 mg QID
15-60 mg QID
2-20 mg QID
2-20 drops QID
Adrenergic agonist Clonidine 0.1-0.3 mg TID
Somatostatin analog Octreotide 50-250 µg SQ TID
Bile acid-binding resin Cholestyramine 4 g once daily to QID
Fiber supplements Psyllium
Calcium polycarbophil
10-20 g daily
5-10 g daily
Others Probiotics
Herbals (berberine,
arrowroot) 48