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Difficulty: HardGastrointestinal and Abdominal Surgery

A 54-year-old woman is evaluated in the hospital due to a rapid change in her clinical status. She was admitted 24 hours ago for nausea, bilious emesis, an inability to pass flatus, and crampy abdominal pain. Her surgical history is notable for an open myomectomy five years ago. On admission, she was afebrile with normal vital signs, and an abdominal radiograph revealed multiple dilated loops of small intestine with air-fluid levels but no free intraperitoneal air. She was appropriately started on intravenous fluids, bowel rest, and nasogastric tube decompression. Over the past two hours, the patient reports that her abdominal pain has shifted from an intermittent, crampy character to a severe, constant ache. Current vital signs show a temperature of 38.8 C (101.8 F), heart rate of 118/min, blood pressure of 100/60 mm Hg, and respiratory rate of 22/min. Physical examination now reveals a significantly distended abdomen with localized rigidity, guarding, and rebound tenderness in the right lower quadrant. Laboratory studies demonstrate a leukocyte count of 16,500/mm³ with 15% band forms, and a serum lactate level of 3.8 mmol/L. Which of the following is the most appropriate next step in the management of this patient?

  1. Immediate exploratory laparotomyAnswer
  2. B
    Computed tomography scan of the abdomen and pelvis with intravenous contrast
  3. C
    Administration of a water-soluble contrast agent via the nasogastric tube
  4. D
    Continued nasogastric decompression and reassessment in 12 hours
  5. E
    Initiation of broad-spectrum intravenous antibiotics and serial abdominal examinations

Answer

Immediate exploratory laparotomy
This patient initially presented with an uncomplicated small bowel obstruction (SBO), for which conservative management with nasogastric decompression and bowel rest was appropriate. However, her clinical picture has drastically changed. She has developed fever, tachycardia, continuous (rather than crampy) abdominal pain, focal peritonitis (rigidity, guarding, rebound tenderness), significant leukocytosis, and elevated serum lactate. This constellation of findings indicates the development of bowel strangulation and ischemia. When an SBO becomes complicated by ischemia or perforation, conservative management has definitively failed, and the patient requires an immediate exploratory laparotomy. Delaying surgery for any reason increases the risk of frank bowel necrosis, overwhelming sepsis, and death.

Step-by-Step Solution

1
Evaluate the initial presentation and management
The patient initially had an uncomplicated small bowel obstruction (SBO) likely due to postoperative adhesions, which was correctly managed with conservative measures (NG tube, IV fluids).
Most adhesion-related SBOs resolve with conservative management and do not require immediate surgery unless complications are present.
2
Identify the change in clinical status
The patient developed a fever, tachycardia, shift from crampy to continuous pain, focal peritoneal signs, marked leukocytosis, and lactic acidosis.
These are red flag symptoms that suggest the bowel obstruction has progressed from a simple obstruction to a strangulated one with compromised blood flow.
3
Determine the next best step in management
The standard of care transitions immediately from conservative management to emergent surgical exploration.
Strangulated SBO leads to bowel necrosis, perforation, and death if source control (resection of ischemic bowel) is not achieved immediately. Further imaging or conservative steps are contraindicated.

Key Concept

Management of complicated small bowel obstruction (SBO)
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Topics

Gastrointestinal and Abdominal Surgery

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