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Difficulty: MediumGastrointestinal and Abdominal Surgery

A surgical consult is requested for a 67-year-old woman who has been hospitalized for the past 3 days due to an acute exacerbation of chronic obstructive pulmonary disease. Since yesterday evening, she has been experiencing worsening, diffuse abdominal cramps and has had three episodes of bilious vomiting. Her last bowel movement was 48 hours ago, and she reports an inability to pass flatus. Her past medical history is significant for an open appendectomy in her twenties and a total abdominal hysterectomy a decade ago. Vital signs show a temperature of 38.6°C (101.5°F), blood pressure of 90/56 mmHg, and a heart rate of 122 beats/minute. On physical examination, her abdomen is distended, tympanitic, and diffusely tender. There is marked guarding and rebound tenderness in all four quadrants. Laboratory studies reveal a leukocyte count of 18,500/mm³ with a 15% bandemia, and a serum lactate level of 4.2 mmol/L. An upright abdominal radiograph displays multiple dilated loops of small intestine with prominent air-fluid levels, and no air is seen in the colon or rectum. Which of the following is the most appropriate next step in the management of this patient?

  1. Immediate exploratory laparotomyAnswer
  2. B
    Placement of a nasogastric tube and serial abdominal examinations
  3. C
    Computed tomography scan of the abdomen and pelvis with intravenous contrast
  4. D
    Administration of broad-spectrum antibiotics and bedside observation
  5. E
    Upper gastrointestinal series with water-soluble contrast

Answer

Immediate exploratory laparotomy
This patient presents with a classic clinical picture of a complete small bowel obstruction (SBO), likely secondary to adhesions from previous abdominal surgeries (appendectomy and hysterectomy). However, she has developed signs indicating a complicated obstruction, such as strangulation or severe ischemia. These signs include fever, tachycardia, hypotension, marked leukocytosis with bandemia, an elevated serum lactate level, and an acute abdomen with rebound tenderness and guarding. When an SBO is complicated by bowel ischemia, strangulation, or perforation, conservative management is no longer appropriate. The definitive and life-saving management is immediate fluid resuscitation accompanied by emergent exploratory laparotomy to resect any necrotic bowel and relieve the obstruction. Delaying surgery for further imaging (such as a CT scan) in an unstable patient with overt peritonitis is contraindicated and increases mortality.

Step-by-Step Solution

1
Analyze the clinical presentation and radiographic findings
Patient has symptoms of small bowel obstruction (SBO) including vomiting, obstipation, and dilated bowel loops with air-fluid levels on X-ray.
Establishing the primary diagnosis is the first step in formulating a management plan.
2
Identify red flag signs of complicated SBO (strangulation, ischemia, or perforation)
The patient demonstrates fever, tachycardia, hypotension, elevated lactate, leukocytosis, and diffuse peritonitis (guarding and rebound tenderness).
Differentiating uncomplicated from complicated SBO is critical, as it changes the management from conservative to surgical.
3
Determine the most appropriate immediate intervention based on the clinical status
Due to signs of bowel strangulation and hemodynamic instability, emergent surgical exploration is indicated without further diagnostic delay.
Prolonged ischemia leads to bowel necrosis and perforation; prompt laparotomy is life-saving.

Key Concept

Patients with a small bowel obstruction who develop signs of peritonitis, fever, tachycardia, or metabolic acidosis (elevated lactate) should undergo immediate exploratory laparotomy due to high suspicion of bowel ischemia or strangulation.
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Topics

Gastrointestinal and Abdominal Surgery

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