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Difficulty: HardGastroenterology and Hepatology

A 58-year-old man presents to the outpatient clinic with a 2-day history of steady left lower quadrant abdominal pain. The pain is associated with mild nausea and a decreased appetite. He denies vomiting, hematochezia, or melena. He has a history of essential hypertension treated with amlodipine. He underwent a screening colonoscopy three years ago, which revealed scattered diverticula but no polyps or malignancy. Vital signs are temperature 37.6°C (99.7°F), blood pressure 132/82 mmHg, heart rate 84/min, and respiratory rate 16/min. The abdomen is soft and non-distended. There is focal tenderness to deep palpation in the left lower quadrant, but no guarding or rebound tenderness is appreciated. Complete blood count shows a leukocyte count of 11,200/mm³. A CT scan of the abdomen and pelvis with contrast reveals focal thickening of the sigmoid colon wall and adjacent pericolic fat stranding. There are no fluid collections, abscesses, pneumatosis, or free intraperitoneal air. Which of the following is the most appropriate next step in management?

  1. A
    Hospitalization and initiation of intravenous piperacillin-tazobactam
  2. B
    Urgent colonoscopy to evaluate for underlying malignancy
  3. Oral fluid hydration, symptom control, and observationAnswer
  4. D
    Initiation of oral ciprofloxacin and metronidazole
  5. E
    CT-guided percutaneous drainage of the affected colonic segment

Answer

Oral fluid hydration, symptom control, and observation
The correct approach is oral fluid hydration, symptom control, and observation. This patient has acute uncomplicated diverticulitis, defined as localized colonic inflammation without evidence of complications (such as an abscess, fistula, or free perforation) on CT imaging, and no signs of systemic toxicity or immunosuppression. Current guidelines from the American Gastroenterological Association (AGA) strongly advise against the routine use of antibiotics for acute uncomplicated diverticulitis in immunocompetent patients. Large randomized trials have demonstrated that antibiotic therapy in this specific population offers no benefit in time to clinical recovery or the prevention of complications (such as progression to perforation or abscess). Appropriate management consists of temporary bowel rest (a clear liquid diet), adequate oral hydration, and close outpatient follow-up.

Step-by-Step Solution

1
Analyze the clinical presentation and diagnostic imaging.
The patient has left lower quadrant pain, mild leukocytosis, and a CT scan showing sigmoid thickening and fat stranding without abscess or perforation. This confirms a diagnosis of acute uncomplicated diverticulitis.
To classify the disease severity, which dictates the need for medical versus interventional management.
2
Assess the patient's systemic stability and risk factors.
The patient is immunocompetent, hemodynamically stable, and does not meet criteria for Systemic Inflammatory Response Syndrome (SIRS).
To determine if inpatient admission or aggressive systemic therapy is warranted.
3
Select the guideline-directed management for this specific disease state.
Current guidelines indicate that immunocompetent patients with acute uncomplicated diverticulitis should be managed conservatively with oral hydration and bowel rest without routine antibiotics.
Recent high-quality evidence shows antibiotics do not accelerate recovery or prevent complications in mild cases, emphasizing antibiotic stewardship.

Key Concept

Management of acute uncomplicated diverticulitis
Estimated Time:1m 30s
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Topics

Gastroenterology and Hepatology

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