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Difficulty: HardGastrointestinal and Abdominal Surgery

An 81-year-old woman is brought to the emergency department from a long-term care facility due to severe, unrelenting abdominal pain and recurrent bilious vomiting for the past 24 hours. She has not had a bowel movement or passed flatus for 2 days. Her medical history includes atrial fibrillation, hypertension, and osteoarthritis. She has no history of previous abdominal surgeries. Her temperature is 38.6°C (101.5°F), pulse is 122/min, and blood pressure is 94/56 mm Hg. Physical examination reveals a markedly distended and tympanic abdomen with diffuse guarding and rebound tenderness. Bowel sounds are absent. A firm, exquisitely tender, 4-cm mass is palpable in the right groin, located inferior to the inguinal ligament and medial to the femoral artery pulsation. The skin overlying the mass is erythematous and dusky. Laboratory studies show a leukocyte count of 19,500/mm³ and a serum lactate of 4.2 mmol/L. Which of the following is the most appropriate next step in management?

  1. Immediate surgical explorationAnswer
  2. B
    Computed tomography of the abdomen and pelvis
  3. C
    Nasogastric tube decompression and serial examinations
  4. D
    Bedside manual reduction of the groin mass
  5. E
    Systemic anticoagulation with intravenous heparin

Answer

The most appropriate next step is immediate surgical exploration to relieve the obstruction and resect any necrotic bowel.
The correct answer is immediate surgical exploration. This patient presents with a small bowel obstruction complicated by a strangulated femoral hernia, indicated by the painful, non-reducible groin mass specifically located below the inguinal ligament. The presence of fever, tachycardia, hypotension, leukocytosis, elevated lactate, and peritonitis (guarding, rebound tenderness) are hallmark signs of bowel ischemia and necrosis. In the setting of a complicated mechanical obstruction with peritonitis or hemodynamic instability, immediate surgical intervention is required to resect necrotic bowel and repair the hernia defect.

Step-by-Step Solution

1
Identify the primary clinical syndrome
The patient presents with severe abdominal pain, bilious vomiting, obstipation, and a distended tympanic abdomen, indicating a small bowel obstruction (SBO).
Recognizing the core pathology narrows down the differential diagnosis.
2
Localize the etiology based on physical examination
The presence of a tender, non-reducible mass inferior to the inguinal ligament and medial to the femoral pulse specifically indicates a femoral hernia.
Physical exam findings are crucial for differentiating the specific anatomical cause of a mechanical bowel obstruction.
3
Assess for complications indicating ischemia or necrosis
Fever, tachycardia, hypotension, localized skin erythema, leukocytosis, elevated lactate, and diffuse peritonitis confirm that the herniated bowel segment is strangulated.
Identifying strangulation is the critical decision point that dictates the urgency and type of intervention.
4
Determine the next best step in management
A strangulated SBO with peritonitis requires immediate surgical exploration to relieve the obstruction, resect necrotic bowel, and repair the hernia defect.
Surgical emergencies with peritonitis must not be delayed by further imaging or conservative measures.

Key Concept

Patients with a small bowel obstruction complicated by signs of strangulation (fever, hemodynamic instability, peritonitis, lactic acidosis) require immediate surgical exploration without delaying for further imaging.
Estimated Time:1m 30s
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Topics

Gastrointestinal and Abdominal Surgery

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