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  1. When should ischemic colitis be suspected?

  2. What are the key diagnostic tests for ischemic colitis, diverticulitis, acute appendicitis, colonic obstruction, and colonic pseudoobstruction?

  3. How is diverticulitis medically managed? What are the indications for surgery in patients with diverticulitis?

  4. What are the therapeutic options for colonic obstruction? for colonic pseudoobstruction?

Large bowel disorders (LBD) impose a substantial burden on Americans, accounting for more than 1% of all inpatient admissions, contributing as comorbidities to other hospitalizations, and resulting in expenditures of more than $20 billion annually, which is likely to increase as the population ages. This chapter describes disorders of ischemic colitis, diverticulitis, acute appendicitis, colonic obstruction, and colonic pseudoobstruction. Other disorders, including lower gastrointestinal bleeding, inflammatory bowel diseases, tumors and cancer of the colon, and diarrhea are described in chapters dedicated to those disorders. Table 162-1 describes key diagnostic tests and therapeutic options for important large bowel disorders, while Table 162-2 describes the colonoscopic findings.

Table 162-1 Key Diagnostic Tests and Therapies for Important Large Bowel Diseases in Hospitalized Patients

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