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Difficulty: EasyGastrointestinal and Abdominal Surgery

A 5454-year-old woman presents to the emergency department complaining of excruciating abdominal pain and bilious emesis for the past 2424 hours. The pain was initially intermittent and crampy but has become constant and diffuse over the last 44 hours. She underwent an open myomectomy 88 years ago. Vital signs show a temperature of 39.1∘C39.1^\circ\text{C} (102.4∘F102.4^\circ\text{F}), a pulse of 128/min128/\text{min}, and a blood pressure of 86/50 mm Hg86/50 \text{ mm Hg}. Physical examination reveals a markedly distended abdomen with board-like rigidity, diffuse involuntary guarding, and pronounced rebound tenderness. Laboratory evaluation shows a leukocyte count of 22,000/mm322,000/\text{mm}^3 and a serum lactate concentration of 4.8 mmol/L4.8 \text{ mmol/L}. Which of the following is the most appropriate next step in management?

  1. Perform an urgent laparotomyAnswer
  2. B
    Place a nasogastric tube for bowel decompression
  3. C
    Obtain a CT scan of the abdomen and pelvis
  4. D
    Order acute abdominal series radiographs
  5. E
    Administer broad-spectrum intravenous antibiotics and admit for observation

Answer

The correct answer is to perform an urgent laparotomy.
The correct action is to proceed directly to the operating room. This patient is presenting with classic signs of a strangulated small bowel obstruction (SBO) that has likely progressed to bowel ischemia or perforation. This is evidenced by her transition from intermittent to constant abdominal pain, hemodynamic instability (hypotension, tachycardia), high fever, significant lactic acidosis, and frank peritonitis (rigidity, rebound tenderness). In any patient with an acute surgical abdomen demonstrating generalized peritonitis and shock, the definitive and immediate next step is urgent laparotomy. The goal is rapid source control, resection of necrotic bowel, and prevention of further clinical deterioration.

Step-by-Step Solution

1
Analyze the patient's clinical presentation, vital signs, and physical examination findings.
The patient has a history of prior abdominal surgery and now presents with hemodynamic instability (hypotension, tachycardia), high fever, and an acute abdomen (board-like rigidity, guarding, rebound tenderness).
To accurately determine the severity of the patient's condition and rule out stable vs. unstable presentations.
2
Synthesize the clinical and laboratory data to formulate a working diagnosis.
The combination of previous surgery, progressive unremitting pain, peritonitis, significant leukocytosis, and elevated serum lactate strongly points to a strangulated small bowel obstruction complicated by bowel ischemia or frank perforation.
Identifying the transition from a simple obstruction to a strangulated obstruction is the most critical decision point.
3
Determine the optimal management pathway based on the diagnosis and patient stability.
Immediate operative intervention is definitively indicated. Further diagnostic imaging or conservative measures are contraindicated.
Hemodynamically unstable patients with generalized peritonitis must undergo urgent surgical exploration to achieve source control and resect necrotic tissue.

Key Concept

Patients with a suspected small bowel obstruction who exhibit signs of clinical deterioration, hemodynamic instability, or peritonitis (e.g., rigidity, rebound tenderness, severe lactic acidosis) require immediate exploratory laparotomy, and further diagnostic imaging should be bypassed.
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Topics

Gastrointestinal and Abdominal Surgery

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