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Difficulty: MediumGastrointestinal and Abdominal Surgery

A 47-year-old woman is evaluated in the hospital during the evening shift for a sudden change in her clinical status. She was admitted 48 hours ago for a partial small bowel obstruction, attributed to adhesions from a previous total abdominal hysterectomy. Initial therapy with intravenous fluids and bowel rest resulted in a decrease in her abdominal distention. Over the past 3 hours, however, she reports a sudden onset of excruciating, unremitting abdominal pain. Her temperature is 39.1°C (102.4°F), blood pressure is 88/54 mm Hg, pulse is 122/min, and respirations are 22/min. Physical examination reveals a rigid abdomen with severe diffuse rebound tenderness and involuntary guarding. Laboratory studies show a leukocyte count of 21,000/mm³ with 15% band forms. Arterial blood gas analysis reveals a pH of 7.28, pCO2pCO_2 of 32 mm Hg, and a bicarbonate (HCO3−HCO_3^-) of 15 mEq/L. Serum lactate is 5.8 mmol/L. Which of the following is the most appropriate next step in the management of this patient?

  1. Emergent exploratory laparotomyAnswer
  2. B
    Urgent contrast-enhanced abdominal computed tomography
  3. C
    Continuation of nasogastric suction and intravenous fluid resuscitation
  4. D
    Transfer to the intensive care unit for initiation of vasopressor therapy and observation
  5. E
    Initiation of broad-spectrum intravenous antibiotics and surgical reassessment in 12 hours

Answer

Emergent exploratory laparotomy
The correct answer is emergent exploratory laparotomy. This patient initially presented with an uncomplicated small bowel obstruction (SBO) and was appropriately managed conservatively. However, she has now developed classic signs of strangulation and bowel ischemia. These signs include a sudden change to continuous and excruciating abdominal pain, hemodynamic instability (hypotension, tachycardia), fever, overt peritonitis (rigid abdomen, rebound tenderness), marked leukocytosis with a left shift, and lactic acidosis. When an SBO is complicated by bowel ischemia, necrosis, or perforation, conservative management must be abandoned immediately in favor of emergent surgical exploration to resect the nonviable bowel and achieve source control.

Step-by-Step Solution

1
Analyze the patient's change in clinical presentation from admission to current status.
The patient transitioned from an uncomplicated partial bowel obstruction to having severe, unremitting pain, fever, hypotension, tachycardia, and a rigid abdomen with rebound tenderness.
These are classic signs of peritonitis and systemic inflammatory response syndrome (SIRS), indicating clinical deterioration.
2
Evaluate the significance of the laboratory findings.
The patient has marked leukocytosis with a left shift and high anion gap metabolic acidosis (elevated lactate of 5.8 mmol/L, pH 7.28).
Lactic acidosis in the context of an existing bowel obstruction strongly points to bowel strangulation, tissue hypoperfusion, and necrosis.
3
Determine the optimal management step based on the clinical and laboratory assessment.
The patient requires immediate surgical exploration.
In a patient with an established small bowel obstruction who develops peritonitis or hemodynamic instability, immediate operative intervention is mandated to resect ischemic bowel and prevent death.

Key Concept

Indications for emergent surgical exploration in small bowel obstruction

Alternative Method

Recognizing the triad of fever, tachycardia, and localized tenderness in any patient with a known SBO should immediately trigger a surgical consult for operative management, even before labs return.
Estimated Time:1m 15s
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Topics

Gastrointestinal and Abdominal Surgery

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