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Understanding Toxic Megacolon: Etiology, Diagnosis, and Treatment

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Toxic megacolon is a severe complication characterized by colonic dilatation and systemic toxicity, most commonly affecting the transverse colon. It can arise from conditions such as inflammatory bowel disease (IBD), infectious colitis due to C. diff, and ischemic colitis, among others. The condition can be precipitated by factors like hypokalemia and administration of anticholinergics or opioids. Symptoms include fever, abdominal distension, and altered sensorium. Diagnosis involves radiographic examination, while treatment focuses on bowel rest, medical therapy, and, in some cases, surgery.

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Understanding Toxic Megacolon: Etiology, Diagnosis, and Treatment

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  1. February 10, 2011

  2. Toxic Megacolon Total or segmental nonobstructive colonic dilatation PLUS systemic toxicity Most commonly transverse colon

  3. Toxic Megacolon:Etiology • IBD • Infectious colitis • C. diff • Salmonella, shigella, campylobacter • CMV • Amoebic colitis • Ischemic colitis • Volvulus • Diverticulitis • Obstructive colon cancer

  4. Toxic Megacolon: Precipitating Factors Hypokalemia Antimotility agents Opiates Anticholinergics Antidepressants Barium enema Colonoscopy

  5. Clinical Manifestations Toxic appearing Altered sensorium Hypotension/tachycardia Fever Abd distension and tenderness +/- peritoneal signs

  6. Diagnosis • Radiographic colonic distention • PLUS 3 of following • Fever>38 • Tachycardia • Leukocytosis • Anemia • PLUS at least 1 of the following • Dehydration • Altered sensorium • Electrolyte disturbances • Hypotension

  7. Treatment • Goal: reduce severity of colitis • Restore normal motility • Decrease likelihood of perforation • Medical therapy is successful in preventing surgery in 50% • Surgical team should be consulted

  8. Treatment • Complete bowel rest • NG tube • ICU monitoring • Serial abdominal exams • CBC, lytes, KUB q 12 • Appropriate treatment if IBD present • Steroids • Avoid steroids for infectious etiology

  9. Treatment • Broad spectrum abx • Third-generation cephalosporin • Metronidazole • Discontinue • Antimotility meds • Opiates • Anticholinergics • Generous IVF

  10. Surgery: Indications Perforation No improvement in 3 days

  11. Nutrition • TPN if needed • Resume enteral feedings with first signs of improvement • Mucosal healing • Motility

  12. C. Diff and Toxic Megacolon Stop offending agent Vancomycin PO Flagyl IV

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