Feigin 1996.

Methods	A prospective randomised clinical trial. Patients randomised to the usual conservative treatment of small bowel obstruction or given Gastrografin as well as the usual treatment.
Participants	Patients who had previous abdominal surgery and presented with small bowel obstruction on clinical assessment and radiological examination.
Interventions	All patients were treated by nasogastric suction and iv fluid. Patients in the Gastrografin group were given100 ml of water soluble contrast via nasogastric tube which was then clamped for 60 minutes. In either groups patients who developed signs of strangulation were operated on.
Outcomes	Resolution of the obstruction or the need for surgery was compared in both groups as well as hospital stay and time from admission to resolution.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ Adequate