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Difficulty: MediumGastrointestinal and Abdominal Surgery

A 61-year-old male is currently hospitalized on the surgical ward undergoing treatment for a mechanical small bowel obstruction. He was admitted two days ago with colicky abdominal pain, significant abdominal distention, and obstipation. His past medical history is notable for an exploratory laparotomy for a ruptured appendix during childhood.

Initial management with strict nothing-by-mouth status, intravenous crystalloids, and nasogastric tube decompression resulted in moderate symptomatic relief and decreased abdominal distention. However, over the past three hours, the nursing staff urgently requests an evaluation due to a dramatic clinical change.

The patient now complains of excruciating, unrelenting, and constant abdominal pain. His temperature is 39.1°C (102.4°F), pulse is 128/min, blood pressure is 88/52 mmHg, and respirations are 24/min. Physical examination reveals a rigid, distended abdomen with diffuse rebound tenderness and involuntary guarding. Bowel sounds are entirely absent. A point-of-care venous blood gas shows a pH of 7.28 and 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. Emergent exploratory laparotomyAnswer
  2. B
    Computed tomography of the abdomen and pelvis with intravenous contrast
  3. C
    Administration of enteral water-soluble contrast medium
  4. D
    Continuation of nasogastric decompression and initiation of broad-spectrum antibiotics
  5. E
    Urgent bedside diagnostic laparoscopy

Answer

Emergent exploratory laparotomy
The correct answer is emergent exploratory laparotomy. This patient initially presented with an uncomplicated mechanical small bowel obstruction that was appropriately managed with conservative measures (bowel rest, intravenous fluids, and nasogastric decompression). However, he has now developed classic signs of bowel strangulation and ischemia: the pain has shifted from colicky to constant and severe, and he has developed fever, tachycardia, hypotension, severe lactic acidosis, and unequivocal peritonitis (rigidity, rebound tenderness, guarding). When a small bowel obstruction becomes complicated by strangulation, ischemia, or perforation, conservative management must be immediately abandoned. The patient requires emergent open surgical exploration to identify and resect the ischemic or necrotic segment of bowel.

Step-by-Step Solution

1
Analyze the patient's initial presentation and current clinical course.
The patient transitioned from a stable, uncomplicated small bowel obstruction to demonstrating sudden and rapid clinical deterioration.
Recognizing the shift in the clinical picture is crucial for identifying complications of a bowel obstruction.
2
Evaluate the patient's current vital signs and physical examination.
The patient is now febrile, tachycardic, and hypotensive, with a rigid abdomen, rebound tenderness, and elevated serum lactate.
These findings collectively indicate the development of bowel ischemia, strangulation, or perforation leading to peritonitis and early septic shock.
3
Determine the appropriate intervention for a strangulated small bowel obstruction.
Immediate surgical exploration is indicated over continued observation or further diagnostic imaging.
Definitive open surgical management is required to resect necrotic bowel, control intra-abdominal contamination, and restore gastrointestinal continuity before irreversible shock occurs.

Key Concept

Management of complicated small bowel obstruction (ischemia and strangulation)
Estimated Time:1m 15s
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Topics

Gastrointestinal and Abdominal Surgery

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