A prospective study on the use of water-soluble contrast follow-through radiology in the management of small bowel obstruction

Background: The purpose of this prospective study was to determine the value of water-soluble contrast follow-through radiology in predicting the outcome in patients with small bowel obstruction. Methods: Patients with clinical and radiological evidence of small bowel obstruction were selected according to pre-set criteria. A water-soluble contrast follow-through examination using 76% urografin was carried out within 24 h of hospital admission. The result was interpreted as 'significant obstruction' if the contrast failed to reach the caecum in 4 h or if there was a clear cut-off in the gastrointestinal tract. The result was interpreted as 'insignificant obstruction' if the contrast reached the caecum within 4 h. The surgeon was blinded to the result of the contrast examination in the patient management, and the decision to operate was based entirely on conventional clinical grounds. Results. Fifty-one patients in an 18 month period underwent the contrast examinations. Thirty-four patients (67%) had had previous abdominal operations. The results showed that significantly more patients who had 'significant obstruction' on contrast radiology required surgery to relieve the intestinal obstruction (17/19) than those who had 'insignificant obstruction' (1/32, Fisher's exact test, P < 0.0001). This difference was found to be significant in both patient subgroups: patients with or without previous abdominal operation. There was no major morbidity or mortality related to the contrast radiology procedure. Conclusions: Urografin follow-through examination is a safe procedure; using 4 h as the cut-off it is highly predictive of the outcome in small bowel obstruction in patients with or without previous abdominal operation.