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Difficulty: MediumGastrointestinal and Abdominal Surgery

An inpatient surgical consult is requested for a 62-year-old male on the medical ward who was admitted two days ago for a small bowel obstruction. He has a history of an open appendectomy in childhood. Initially, his symptoms improved with bowel rest and nasogastric decompression. Over the past 4 hours, however, his clinical status has rapidly declined. Current vital signs show a temperature of 38.6°C (101.5°F), heart rate of 118/min, and blood pressure of 98/60 mm Hg. Physical examination reveals a distended abdomen with marked tenderness, guarding, and rebound in the right lower quadrant. Laboratory studies demonstrate a leukocyte count of 18,500/mm³ and a serum lactate of 4.2 mmol/L. Intravenous fluid resuscitation is immediately initiated. Which of the following is the most appropriate next step in management?

  1. Surgical exploration of the abdomenAnswer
  2. B
    Continuation of nasogastric tube decompression and observation
  3. C
    Computed tomography scan of the abdomen and pelvis
  4. D
    Administration of an enteral hyperosmolar radiopaque contrast agent
  5. E
    Broad-spectrum intravenous antibiotics and reassessment in 12 hours

Answer

Surgical exploration of the abdomen is the most appropriate next step because the patient has developed signs of strangulation and peritonitis.
The correct answer identifies the need for immediate surgical intervention. This patient initially presented with a small bowel obstruction (likely secondary to adhesions from a prior appendectomy). While conservative management (bowel rest, nasogastric decompression) is the standard initial approach for uncomplicated obstructions, this patient's clinical status has drastically changed. The development of fever, tachycardia, hypotension, localized peritonitis (rebound, guarding), severe leukocytosis, and lactic acidosis indicates that the bowel has become ischemic or infarcted (strangulated obstruction). The definitive and most urgent next step is surgical exploration of the abdomen to resect necrotic tissue and correct the obstruction.

Step-by-Step Solution

1
Analyze the patient's initial presentation and clinical course.
The patient initially had an uncomplicated small bowel obstruction that was managed conservatively, but he has now acutely deteriorated.
Tracking the clinical trajectory helps differentiate between resolving, non-resolving, and complicated bowel obstructions.
2
Evaluate the current physical examination and laboratory findings.
The patient has fever, tachycardia, hypotension, localized peritonitis (guarding and rebound tenderness), leukocytosis, and elevated lactate.
These findings are classic red flags for bowel ischemia, infarction, or perforation (strangulated obstruction).
3
Determine the management guidelines for complicated small bowel obstruction.
Immediate surgical intervention is required to resect any necrotic bowel and relieve the obstruction.
Conservative management and further diagnostic imaging are contraindicated when overt peritonitis or ischemia is present, as delays increase mortality.

Key Concept

Surgical indications in small bowel obstruction (identifying strangulation/ischemia).
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Topics

Gastrointestinal and Abdominal Surgery

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