Fulminant CDI with shock, ileus or megacolon requires high-dose enteral vancomycin, IV metronidazole, ileus-directed drug delivery and early surgical rescue planning.
Hypotension/shock, ileus or toxic megacolon defines a fulminant phenotype. Ileus may markedly reduce diarrhea, so absence of frequent stool does not exclude life-threatening CDI. Assess lactate, WBC, renal function, abdominal distension/peritonism and CT findings when transport is safe.
Give vancomycin 500 mg enterally four times daily plus IV metronidazole 500 mg every 8 hours; if ileus is present, add rectal vancomycin when feasible. Resuscitate shock, correct electrolyte/renal complications and stop unnecessary inciting antibiotics/antimotility drugs.
Obtain early surgical consultation at diagnosis of fulminant disease rather than waiting for medical failure. Worsening shock, peritonitis/megacolon, organ failure, rising lactate or marked/rising leukocytosis should accelerate operative discussion. Subtotal colectomy with rectal preservation is the classic rescue operation; selected centers may use diverting loop ileostomy/colonic lavage strategies.
Current IDSA/SHEA CDI guidance; fulminant regimen remains high-dose enteral vancomycin plus IV metronidazole, with rectal vancomycin considered for ileus.
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