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Difficulty: MediumGastrointestinal and Abdominal Surgery

A 59-year-old woman arrives at the surgical triage unit complaining of excruciating, unremitting abdominal pain. She initially developed intermittent cramping, abdominal distension, and bilious vomiting three days ago, but states the pain acutely worsened and became continuous this morning. She has a history of an open appendectomy in childhood. Her temperature is 38.9°C (102.0°F), blood pressure is 88/54 mmHg, and pulse is 126/min. The abdomen is tensely distended and exquisitely tender to light palpation in all four quadrants, with marked rigidity and rebound tenderness. Bowel sounds are absent. Complete blood count shows a leukocyte count of 21,000/mm³ with a left shift. Serum chemistry reveals a lactate level of 5.2 mmol/L. Which of the following is the most appropriate next step in the management of this patient?

  1. Immediate exploratory laparotomyAnswer
  2. B
    Computed tomography of the abdomen and pelvis with intravenous contrast
  3. C
    Nasogastric tube placement and serial abdominal examinations
  4. D
    Administration of water-soluble oral contrast medium
  5. E
    Intravenous broad-spectrum antibiotic therapy and intensive care unit admission

Answer

Immediate exploratory laparotomy
The patient's presentation is classic for a small bowel obstruction (SBO) complicated by strangulation and bowel ischemia. While an uncomplicated SBO typically presents with colicky abdominal pain, nausea, vomiting, and obstipation, the transition to continuous, severe pain is a hallmark of bowel strangulation (compromised blood flow). Furthermore, the patient exhibits systemic toxicity (fever, hypotension, marked tachycardia, leukocytosis, and lactic acidosis) alongside frank peritonitis (rigidity, absent bowel sounds, and rebound tenderness). In any patient presenting with an acute surgical abdomen, hemodynamic instability, and a high clinical suspicion for ischemic or perforated bowel, the most appropriate next step in management is immediate exploratory laparotomy. Attempting further diagnostic imaging or continuing conservative management in this scenario significantly increases the risk of mortality.

Step-by-Step Solution

1
Identify the primary clinical syndrome from the patient's history.
The patient's initial presentation of intermittent cramping, bilious emesis, abdominal distension, and a history of prior abdominal surgery strongly suggests an adhesive small bowel obstruction.
Establishing the baseline etiology is necessary to contextualize the patient's sudden deterioration.
2
Evaluate the patient's current clinical status for life-threatening complications.
The patient has transitioned from intermittent to continuous pain and now exhibits fever, hypotension, marked tachycardia, a rigid abdomen with rebound tenderness, leukocytosis, and an elevated serum lactate.
These specific findings indicate that the obstruction has progressed to bowel strangulation with ischemia and probable necrosis or perforation.
3
Determine the appropriate intervention based on hemodynamic stability and the presence of peritonitis.
Definitive surgical source control via emergent open surgery is required. Diagnostic imaging or conservative measures must be bypassed.
In the setting of an acute surgical abdomen with hemodynamic instability and suspected ischemic bowel, immediate operative intervention is the only definitive treatment.

Key Concept

Patients with a small bowel obstruction who develop signs of strangulation or ischemia (continuous abdominal pain, fever, peritonitis, hemodynamic instability, lactic acidosis) require immediate exploratory laparotomy, bypassing further diagnostic imaging or conservative management.
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Topics

Gastrointestinal and Abdominal Surgery

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