sep11 summary diarrhea
DESCRIPTION
By Kanjanee Wachirarangsiman, MDTRANSCRIPT
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diarrhea
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• Acute < 2 wk• Invasive vs noninvasive• Invasive: fever,dysentery,severe abdominal
pain, wbc-rbc in stool• Stool c/s in :suspected invasive,
immunocompromise host, protracted diarrhea > 3 day
• Stool for parasite : duration > 7 day
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• Empirical antibiotic : 3-5 day– Ciprofloxacin 1000 mg /day– Norfloxacin 800 mg/day– Levofloxacin 500 mg/day– Azithromycin 500 mg/day
(ped,pregnancy,campylobacter in thai)
• Persistent diarrhea– Metronidazole 250 mg tid :7-10 day(rx:giardia)
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Invasive
• Campylobacter• Samonella• shigella• Vibrio parahaemolyticus• Enterohemorrhagic Escherichia coli
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Campylobacter
• chicken• Resist to ciprofloxacin in Thailand 80%• Guillain-Barre syndrome• Rieter syndrome
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Samonella
• Sepsis in immunocompromised host• ABO: in age< 3 mo,> 50yr AIDS, malignancy• ABO may prolong carrier stage• Reiter syndrome
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shigella
• S.dysenteriae : ABO to all +ve culture,prevent outbreak
• Reiter syndrome• Seizure in children
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Vibrio parahaemolyticus
• Raw fish• Self limited
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E.Coli O 157:H 7
• Dysentery ,no or low grade fever• ABO:risk HUS• meat
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Toxin-induced bacterial gastroenteritis
• Non invasive (bacterial and viral)• Clinical: watery,minimal fever,little or no
abdominal pain,no wbc-rbc in stool
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Non invasive
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Vibrio species
• Except: V.parahaemolyticus• V.gravis (cholera) :rice water, > 1 Liter/hr• V.vulnificus: contact sea water with open
wounds:hemorrhagic bleb+septic shock,MR 50%
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Scomboid fish
• Tuna,Mackerel• Heat stable• Produce histamine ,improper refrigeration• Metallic, bitter or peppery taste
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Ciguatera fish poisoining
• Ciguatoxin neurotoxin• Odorless,taseless• GI symptoms and constellation of neurological
symptoms• Tingling around mouth, painful teeth, burning
feet,CNS chage;ataxia,weakness,vertigo,confusion
• Misdiagnosis :AGE with hyperventilation syndrome
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Enterotoxigenic Escherichia coli(ETEC)
• Most common cause of traveler’s diarrhea
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Clostridium difficile • Normal gut flora• Board spectrum ABOovergrowthproduced
toxin,develops during ABO administration or within 2 wk of discontinue
• Toxin Aattract neutrophil and monocyte• Toxin Bdisrupt colonic epithelial cell• Clinical : same as invasive group• 25% better when stop ABO 48-72 hr• Rx: first line oral or iv metronidazole,if severe
oral vancomycin
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Viral gastroenteritis
• Adult: norovirus• Children: rotavirus• Dx in adult: one of exclusion
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Diarrhea in AIDS• 20-25% multiple pathogens• Cryptosporidium and isospora belli persist in CD4
< 200 cell/mm3
• MAC and CMV in CD4 <100 cell/mm3
• samonella esp. S.typhimurium high risk bacteremia
• Consider strongyloids in any immunocompromised pt whosudden clinical deterioration,eosinophillia,polymicrobial sepsis, meningitis, adynamic ileus
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Diarrhea in AIDS
Diagnosis• H/C : in MAC, samonella, CMV• CBC: eosinophillia in stronyloides, Isospora• Rectal biopsy: CMV inclusion body with clear
halo
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Diarrhea in AIDS
• SE HAART: PInelfinavir, lopinavir/rotinavir• Rx– CMV:ganciclovir,foscarnet– MAC:clarithromycin,azithromycin;poorly response
to rx,death within 6-8 mo after dx– Strongyloid:ivermectin 200 mcg/day 1-2
day,thiabendazole 50 mg/kg/day 2 day, if disseminated rx for at least 5 day
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Traveler’s diarrhea
• ETEC most common• Mild,non dysentery,single dose of
ciprofloxacin 750 mg PO combination with loperamide
• High fever,bloody stools,typical invasive picture, norfloxacin 400 mg bid or ciprofloxacin 500 mg for 3 day