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Difficulty: EasyGastrointestinal and Abdominal Surgery

A 45-year-old woman is evaluated in the emergency department for severe, unremitting abdominal pain and bilious vomiting that started 8 hours ago. She has a history of an open hysterectomy 5 years ago. Her temperature is 39.1°C (102.4°F), pulse is 124/min, and blood pressure is 88/55 mm Hg. Physical examination reveals a markedly distended abdomen. There is diffuse rigidity, guarding, and severe rebound tenderness. Bowel sounds are absent. Laboratory studies show a leukocyte count of 19,000/mm³ and an elevated serum lactate level. An upright plain radiograph of the abdomen demonstrates dilated small bowel loops with multiple air-fluid levels and no free intraperitoneal air. Which of the following is the most appropriate next step in management?

  1. Immediate operative interventionAnswer
  2. B
    Nasogastric tube decompression and clinical observation
  3. C
    Cross-sectional imaging of the abdomen with intravenous contrast
  4. D
    Abdominal ultrasonography
  5. E
    Administration of intravenous antibiotics and supportive care in the intensive care unit

Answer

The correct answer is immediate operative intervention.
The correct answer is immediate operative intervention. This patient presents with classic signs and symptoms of a small bowel obstruction (SBO), likely secondary to adhesions from her previous open hysterectomy. While uncomplicated SBOs can often be managed conservatively with bowel rest and nasogastric decompression, this patient exhibits clear clinical signs of strangulation and bowel ischemia. These alarming features include fever, hemodynamic instability (hypotension, tachycardia), peritonitis (rigidity, guarding, rebound tenderness), pronounced leukocytosis, and lactic acidosis. The presence of peritonitis in a patient with a mechanical bowel obstruction is an absolute indication for emergent surgical exploration. Immediate operative intervention is necessary to resect any ischemic or necrotic bowel segments and prevent impending perforation, overwhelming sepsis, and death.

Step-by-Step Solution

1
Analyze the patient's history and physical examination findings.
The patient has a history of abdominal surgery (open hysterectomy) presenting with bilious vomiting, severe abdominal pain, and a distended abdomen with peritonitis (rigidity, guarding, rebound tenderness), alongside hemodynamic instability (hypotension, tachycardia).
To establish the primary clinical syndrome and assess the severity of the patient's condition.
2
Evaluate the laboratory and imaging results.
Labs show marked leukocytosis and elevated lactate, indicating potential tissue ischemia. The upright abdominal X-ray confirms dilated small bowel loops with air-fluid levels, consistent with a mechanical small bowel obstruction.
To confirm the diagnosis and identify signs of complications such as bowel strangulation or necrosis.
3
Determine the appropriate management strategy based on the presence of complicated features.
The combination of a small bowel obstruction with signs of strangulation (peritonitis, systemic toxicity, lactic acidosis) necessitates immediate surgical intervention rather than conservative management or further diagnostic delay.
Delaying surgery in the presence of ischemic or necrotic bowel significantly increases the risk of perforation, overwhelming sepsis, and mortality.

Key Concept

Management of complicated small bowel obstruction with signs of strangulation.
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Topics

Gastrointestinal and Abdominal Surgery

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