A patient with small bowel obstruction (SBO) from adhesions has been managed non-operatively for 72 hours. Water-soluble contrast (gastrografin) challenge shows contrast reaching the colon at 8 hours. What does this finding imply, and what is the next step?

• A Contrast reaching colon within 24 hours predicts non-operative resolution; continue conservative management ✓
• B Contrast reaching colon indicates complete obstruction — emergency surgery needed
• C Contrast reaching colon indicates an enterocutaneous fistula; surgical repair required
• D Gastrografin has failed; proceed immediately to CT scan with oral contrast

Explanation

The gastrografin challenge (water-soluble contrast via NGT) both treats (hyperosmotic effect stimulates resolution) and diagnoses adhesive SBO. Multiple studies and a Cochrane meta-analysis confirm that appearance of contrast in the colon on abdominal X-ray within 24 hours (most commonly reported as 4-8 hours) has 97% positive predictive value for non-operative resolution and avoids surgery. Failure of contrast to reach the colon predicts need for operative intervention with high sensitivity and specificity. This protocol reduces hospital stay, reduces operative rate, and has become the standard management algorithm for adhesive SBO without strangulation signs.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.