In adhesive small bowel obstruction (SBO) with no signs of strangulation, which clinical/radiological finding is the strongest indication for urgent surgical intervention?
- A CT showing a closed-loop obstruction ✓
- B Failure of gastrografin (water-soluble contrast) to reach the colon within 24 hours
- C Serum lactate >2 mmol/L with metabolic acidosis and peritoneal signs
- D Duration of conservative management exceeding 48 hours
Explanation
A closed-loop obstruction on CT (two obstruction points creating an isolated bowel segment, often presenting as a C-shape or whirl sign) is an absolute indication for urgent surgery because it rapidly progresses to strangulation and ischemia regardless of clinical signs. Peritoneal signs and rising lactate indicate strangulation and are surgical indications as well. Failure of gastrografin to reach the colon at 24 hours predicts the need for surgery but is not as immediately urgent as a confirmed closed loop. Duration of conservative management ≥48 hours is a relative trigger but not a firm rule if the clinical picture is improving.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.