In adhesional small bowel obstruction, the Gastrografin challenge (water-soluble contrast study) has therapeutic as well as diagnostic value. Its therapeutic mechanism is attributed to:
- A Hypertonicity drawing fluid into the bowel lumen, stimulating peristalsis and softening the adhesion indirectly ✓
- B Direct lysis of adhesions by the hyperosmolar contrast agent
- C Anti-inflammatory effects reducing peritoneal adhesion strength
- D Stimulating prostaglandin-mediated ileal motility directly
Explanation
Gastrografin (sodium amidotrizoate) is a hyperosmolar water-soluble contrast agent. When administered via nasogastric tube, its hypertonicity draws fluid into the bowel lumen, increasing luminal fluid volume and bowel wall distension, which stimulates peristalsis and may reduce adhesion-related obstruction by promoting passage of bowel content through the constricted segment. This effect, combined with its diagnostic value (appearance of contrast in the colon within 24 hours predicts resolution without surgery), has led to its widespread use. It does not chemically lyse adhesions.
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.