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Difficulty: MediumGastrointestinal and Abdominal Surgery

An otherwise healthy 48-year-old male presents to the triage desk reporting a two-day history of worsening, crampy periumbilical pain. He notes several episodes of vomiting green, foul-smelling fluid since this morning and has not had a bowel movement or passed gas for the last 36 hours. Ten years prior, he underwent an open appendectomy for a perforated appendix.

Currently, his temperature is 37.9°C (100.2°F), heart rate is 115/min, respirations are 18/min, and blood pressure is 105/65 mm Hg.

Physical examination shows significant abdominal distension with tympany to percussion. Auscultation reveals a lack of bowel sounds. The abdomen is tender to deep palpation diffusely, but there is no involuntary guarding or rigidity.

Laboratory results are significant for a leukocyte count of 16,000/mm³ and a serum lactate level of 3.8 mmol/L.

A contrast-enhanced CT scan of the abdomen and pelvis displays dilated loops of small intestine with a distinct transition zone in the right lower quadrant. Additionally, there is thickening of the bowel wall, decreased enhancement of the mucosa at the transition point, and adjacent mesenteric fluid.

Based on these findings, what is the most appropriate next step in the patient's care?

  1. Surgical exploration of the abdomenAnswer
  2. B
    Insertion of a nasogastric tube and serial abdominal examinations
  3. C
    Administration of oral water-soluble contrast medium
  4. D
    Bowel rest, intravenous fluids, and repeat serum lactate measurement
  5. E
    Mesenteric angiography

Answer

Surgical exploration of the abdomen
The correct answer is surgical exploration of the abdomen. This patient presents with a small bowel obstruction (SBO) that is complicated by signs of bowel ischemia and impending strangulation. While many patients with an adhesive SBO can be managed conservatively, the presence of tachycardia, leukocytosis, elevated serum lactate, and critical CT findings (reduced mucosal enhancement and adjacent mesenteric fluid) strongly indicate compromised bowel perfusion. In such cases, immediate operative intervention is mandatory to resect ischemic bowel or release the obstruction before transmural necrosis and free perforation occur, even if classic peritonitis signs like rigidity are absent.

Step-by-Step Solution

1
Analyze the patient's history and physical presentation.
The patient has a history of prior abdominal surgery and presents with classic signs of obstruction (obstipation, bilious vomiting, distension).
To identify the primary clinical syndrome, which is a mechanical small bowel obstruction (SBO), likely secondary to adhesions.
2
Evaluate the objective data for complications.
The patient exhibits tachycardia, mild fever, leukocytosis, elevated serum lactate, and CT findings of reduced bowel wall enhancement with mesenteric fluid.
To differentiate between an uncomplicated SBO and a complicated SBO (ischemia, strangulation, or perforation) which dictates the urgency of treatment.
3
Determine the appropriate management pathway based on findings.
Due to the clear indicators of compromised bowel perfusion and impending necrosis, conservative management must be bypassed in favor of immediate operative intervention.
To prevent transmural bowel infarction, sepsis, and death.

Key Concept

Patients with a small bowel obstruction who demonstrate clinical, laboratory, or radiographic signs of bowel ischemia or strangulation require immediate surgical exploration.
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Topics

Gastrointestinal and Abdominal Surgery

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