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Difficulty: MediumGastrointestinal and Abdominal Surgery

An 78-year-old female resident of an assisted living facility is evaluated in the emergency department for a 3-day history of progressively worsening, crampy abdominal pain and recurrent vomiting of dark green fluid. She has not passed flatus or had a bowel movement for the past 48 hours. Her past medical history includes hypertension, type 2 diabetes mellitus, and intermittent episodes of right upper quadrant postprandial pain for which she has repeatedly declined surgical intervention. Her temperature is 37.4°C (99.3°F), blood pressure is 112/68 mmHg, and pulse is 106/min. Physical examination demonstrates a distended, tympanic abdomen with high-pitched, "tinkling" bowel sounds. There is diffuse, mild abdominal tenderness but no guarding or rebound tenderness. Laboratory studies reveal a leukocyte count of 11,500/mm³ and normal serum lactate. An upright abdominal radiograph demonstrates multiple dilated loops of small intestine with prominent air-fluid levels and branching radiolucent lines overlying the liver shadow. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Nasogastric tube decompression and conservative observation
  2. B
    Laparoscopic cholecystectomy
  3. C
    Endoscopic retrograde cholangiopancreatography
  4. Exploratory laparotomy with enterolithotomy aloneAnswer
  5. E
    Exploratory laparotomy with enterolithotomy, cholecystectomy, and fistula closure

Answer

Exploratory laparotomy with enterolithotomy alone
This patient presents with the classic clinical and radiographic features of gallstone ileus. This condition occurs when a large gallstone erodes through the gallbladder wall into the adjacent gastrointestinal tract (most commonly the duodenum), creating a cholecystoenteric fistula. The stone then travels through the intestine and typically impacts at the narrowest portion of the small bowel, the terminal ileum, causing a mechanical small bowel obstruction. The classic radiographic presentation, known as Rigler's triad, includes partial or complete small bowel obstruction, pneumobilia (gas in the biliary tree, visible as branching radiolucencies over the liver), and an ectopic gallstone (not always visible on plain films). The standard of care for gallstone ileus in an elderly, often frail patient is exploratory laparotomy with enterolithotomy alone to relieve the immediate life-threatening obstruction. A one-stage definitive procedure involving enterolithotomy, cholecystectomy, and fistula closure is associated with significantly higher morbidity and mortality and should generally be avoided unless the patient is young, hemodynamically stable, and at low surgical risk.

Step-by-Step Solution

1
Analyze the patient's presentation and radiographic findings.
The combination of small bowel obstruction (dilated loops, air-fluid levels, obstipation) and pneumobilia (branching radiolucencies over the liver) in an elderly female with a history of biliary colic points to a specific diagnosis.
Identifying Rigler's triad establishes the diagnosis of gallstone ileus.
2
Determine the optimal surgical approach for gallstone ileus.
The immediate life-threatening issue is the bowel obstruction. Enterolithotomy alone resolves the obstruction. Adding cholecystectomy and fistula repair increases surgical morbidity and mortality.
Elderly patients with significant comorbidities tolerate prolonged surgeries poorly, making damage-control surgery (enterolithotomy alone) the standard of care.

Key Concept

The diagnosis of gallstone ileus is characterized by small bowel obstruction and pneumobilia. The safest and most appropriate treatment in elderly, frail patients is surgical relief of the obstruction via enterolithotomy alone, deferring definitive biliary surgery.
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Topics

Gastrointestinal and Abdominal Surgery

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