Randomized trial of drainage after cholecystectomy. Suction vaersus static drainage through a main wound versus a stab incision.

One hundred eighty-four patients who underwent biliary surgery were randomly allocated to four groups arranaed in a 2 by 2 design. In 92 patients the drain was brought out through the wound and in the other 92 through a stab incision. In half of the patients in each group the drain was connected to a suction system and in the other half to a sterile bag. Suction was found to impair rather than enhance intraperitoneal drainage. In patients who underwent elective cholecystectomy and early operation for acute cholecystitis, the amount of discharge was more than twice as large when suction was omitted than when it was applied. After common duct operations the amount of discharge was very large and there was little difference in cases with and without suction. Prolonged drainage, static or suction, resulted in an increase in the serum haptoglobin level. Analysis of out data suggested that after a few days the drain starts to act as a traumatic stimulus. No difference was found between cases with the drain brought out through a stab incision and those with the drain brought out through the main wound. A number of studies have ascertained the superiority of closed to open drainage. The results of the present trial lead us to recommend that after biliary surgery the closed us to recommend that after biliary surgery the closed drain should not be connected to a suction apparatus and that after elective cholecystectomy the drain should preferably be removed after a few days.