Toxic Megacolon — Management Pathway

Step-by-step decision

Choose step by step as prompted; reaching an endpoint gives the management recommendation. You can go back a step or restart anytime.

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Full pathway

1. [Decision] Surgery needed?
   Perforation / progressive dilation / no improvement on medical therapy? (Non-obstructive colonic dilation ≥6 cm + systemic toxicity. Causes: IBD (UC > Crohn's), infectious colitis (increasingly C. diff; Salmonella/Shigella/CMV/amoebiasis), ischemia. Jalan criteria: 1) imaging colonic dilation >6 cm (typically transverse colon, highest perforation risk); 2) ≥3 of: fever >38.6°C, HR >120, WBC >10.5×10⁹, anemia; 3) ≥1 of: dehydration/altered mentation/electrolyte disturbance/hypotension. Colonoscopy is contraindicated (perforation risk); a limited sigmoidoscopy may define the cause + check C. diff; daily abdominal X-ray to measure diameter.)
   • Perforation/progressive dilation/no improvement at 24–72 h/worsening → Surgery needed → colectomy
   • Initial, responding to treatment → Initial · medical + co-management
2. [End] Initial · medical + co-management
   Initial, responding to medical therapy (medical-surgical co-management): nil by mouth/NG decompression, fluids and electrolyte correction (potassium), stop antimotility/opioid/anticholinergic drugs, broad-spectrum antibiotics; treat the cause — IBD → IV corticosteroids (first-line), C. diff → oral vancomycin/IV metronidazole (stop the inciting antibiotic); daily abdominal X-ray + exam; early surgical involvement on standby.
3. [End] Surgery needed → colectomy
   Perforation / progressive dilation / no improvement on medical therapy at 24–72 h / worsening toxicity / major bleeding: emergency surgery (subtotal colectomy + end ileostomy); delay to perforation has high mortality. Concurrently aggressive resuscitation, broad-spectrum antibiotics, correct electrolytes; steroids can mask perforation (check the liver dullness daily).

Source guidelines & references

• Toxic megacolon (Jalan criteria; ACG IBD and C. difficile guidelines)

This pathway is our own synthesis of the decision logic in the guidelines above (not the guideline verbatim); thresholds and workflows change as guidelines update — in practice follow the latest guideline, your institution's protocol and the individual patient.

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