A 57-year-old woman is admitted to the intensive care unit with abdominal distention, diarrhea, and hypotension. Evaluation is significant for white blood cell count of 38,000/mL, lactate of 2.5 mmol/L, and stool cultures positive for Clostridium difficile (C. diff) infection. Computed tomography shows diffuse thickening of the ascending and transverse colon. What is the best surgical intervention?