Brochwicz 2003.

Methods	Prospective randomised clinical trial.
Participants	Patients with clinical and radiological diagnosis of adhesive small bowel obstruction.
Interventions	Intervention group given 100ml of Gastrografin orally or via the naso‐gastric tube and abdominal radiograph was obtained after 90 and 240 minutes.
Outcomes	Complete obstruction is diagnosed if the contrast failed to reach the colon after 240 minutes.
Notes	More patients in the control group who did not receive Gastrografin had to have surgery which may indicate a therapeutic benefit from Gastrografin.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	D ‐ Not used