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Difficulty: Very hardGastrointestinal and Abdominal Surgery

A 47-year-old man is reassessed by the surgical team 18 hours after admission for abdominal distension, obstipation, and bilious emesis. He has a history of an open appendectomy for perforated appendicitis three weeks ago. Upon admission, abdominal radiography revealed dilated small bowel loops with multiple air-fluid levels, and he was managed with intravenous hydration and placement of a nasogastric tube. He now reports that his abdominal pain, which was previously intermittent and cramping, has become a continuous, severe ache over the past three hours. Vital signs show a temperature of 38.1°C (100.6°F), blood pressure of 115/75 mmHg, and heart rate of 114/min. Physical examination demonstrates a distended abdomen with localized guarding and focal tenderness in the left lower quadrant. Laboratory studies show a leukocyte count of 14,800/mm³ and a serum bicarbonate level of 16 mEq/L, compared to 9,500/mm³ and 24 mEq/L on admission, respectively. Which of the following is the most appropriate next step in the management of this patient?

  1. Transfer to the operating room for surgical explorationAnswer
  2. B
    Cross-sectional imaging of the abdomen and pelvis with intravenous contrast
  3. C
    Administration of water-soluble enteral contrast to assess for obstruction resolution
  4. D
    Continuation of current supportive therapy for an additional 48 hours
  5. E
    Maintenance of gastrointestinal decompression with addition of broad-spectrum intravenous antibiotics

Answer

Transfer to the operating room for surgical exploration
The correct answer is surgical exploration because the patient has evolved from an uncomplicated obstruction to a complicated, strangulated obstruction. The transition from colicky to continuous pain, coupled with new-onset tachycardia, fever, localized guarding, leukocytosis, and metabolic acidosis (indicated by the falling bicarbonate), points definitively to bowel ischemia. In this setting, the standard of care is immediate operative intervention to resect necrotic bowel and relieve the mechanical obstruction.

Step-by-Step Solution

1
Analyze the patient's initial presentation.
The patient initially presented with an uncomplicated early postoperative small bowel obstruction (EPSBO), evidenced by colicky pain, distension, and appropriate initial management with bowel rest and decompression.
Establishing the baseline helps identify subsequent clinical deterioration.
2
Evaluate the patient's interval clinical changes over the past three hours.
The pain character shifted from intermittent/crampy to continuous and severe. The patient developed tachycardia (114/min), a low-grade fever (38.1°C), and localized guarding.
A shift from colicky to continuous pain, along with systemic inflammatory signs and focal peritonitis, are hallmark clinical indicators of bowel ischemia (strangulation).
3
Interpret the laboratory trends.
Leukocytosis has developed (14,800/mm³), and serum bicarbonate has dropped significantly to 16 mEq/L, indicating a new-onset metabolic acidosis (likely lactic acidosis from ischemic bowel).
Laboratory findings corroborate the physical exam findings of bowel strangulation and dead gut.
4
Determine the definitive management for the identified condition.
The patient has a strangulated small bowel obstruction. The required intervention is immediate surgical exploration.
Once signs of strangulation are present, conservative management must be abandoned immediately. Delaying for further imaging or trials of contrast increases mortality.

Key Concept

Clinical signs of strangulation in a small bowel obstruction (continuous pain, tachycardia, fever, leukocytosis, focal peritonitis, metabolic acidosis) mandate immediate surgical exploration.
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Topics

Gastrointestinal and Abdominal Surgery

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