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Difficulty: MediumGastrointestinal and Abdominal Surgery

An individual in his late sixties is evaluated in the surgical assessment unit due to persistent crampy abdominal pain and multiple episodes of bilious vomiting over the past 48 hours. He reports no passage of stool or flatus since the symptoms began. The patient has a surgical history significant for an open partial colectomy performed a decade ago. Vital signs demonstrate a temperature of 38.5°C (101.3°F), pulse of 118/min, and blood pressure of 96/60 mmHg. Physical examination reveals a markedly distended abdomen with absent bowel sounds. Palpation elicits diffuse guarding and pronounced rebound tenderness, particularly in the periumbilical area. Laboratory investigations show a leukocyte count of 18,200/mm³ with 85% neutrophils and a serum lactate concentration of 4.1 mmol/L. Upright radiograph displays dilated small intestinal loops with prominent air-fluid levels and a complete lack of colonic gas. Which of the following is the most appropriate next step in management?

  1. Surgical exploration of the abdomenAnswer
  2. B
    Insertion of a nasogastric tube and intravenous fluid resuscitation
  3. C
    Cross-sectional imaging of the abdomen and pelvis with intravenous contrast
  4. D
    Administration of a hyperosmolar water-soluble contrast agent
  5. E
    Intravenous broad-spectrum antimicrobial therapy and clinical observation

Answer

Surgical exploration of the abdomen
The correct answer is surgical exploration of the abdomen. This patient has a classic presentation of a small bowel obstruction (SBO) secondary to adhesions from a previous laparotomy. While many cases of SBO can be managed conservatively with bowel rest and nasogastric decompression, the development of fever, tachycardia, localized abdominal tenderness (peritonitis), significant leukocytosis, and elevated serum lactate strongly indicates bowel strangulation (ischemia). When an SBO is complicated by strangulation or impending perforation, conservative management must be abandoned in favor of immediate operative intervention to resect the nonviable bowel and prevent fatal sepsis.

Step-by-Step Solution

1
Analyze the patient's presentation and surgical history.
The patient has a history of prior abdominal surgery, current obstipation, bilious vomiting, and radiologic evidence of dilated small bowel loops, confirming an adhesive small bowel obstruction.
Establishing the primary diagnosis is required before assessing for complications.
2
Evaluate for signs of complications such as ischemia or perforation.
The patient exhibits fever, tachycardia, hypotension, leukocytosis with a left shift, elevated lactate, and localized peritonitis (rebound tenderness and guarding).
These findings reliably indicate that the obstruction has progressed to bowel strangulation and impending or actual necrosis.
3
Determine the definitive management based on the presence of complications.
The presence of peritonitis and hemodynamic instability in the setting of small bowel obstruction mandates immediate operative intervention.
Conservative management is no longer safe when strangulation is evident, as necrotic bowel must be resected promptly.

Key Concept

Management of complicated small bowel obstruction (strangulation)
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Topics

Gastrointestinal and Abdominal Surgery

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