To Drain or Not to Drain after Colorectal Cancer Surgery.

Prophylactic drainage of abdominal cavity after GI surgery has been widely practiced. The most important signal function of prophylactic drain is to detect early complications. But the same drains could be the cause of some of the complications. Although there is a considerable theoretical and practical evidences in favor of drainage, the dispute about "to drain or not to drain" the peritoneal cavity after elective colorectal surgery remains open. Unfortunately, the principle of drainage is not based on any scientific data. During the last three decades, surgeons have made efforts to investigate the value of prophylactic drainage after colorectal surgery. However, the results of trials are contradictory due to lack of quality and/or statistical power and therefore do not provide an answer to the clinical question. A systematic review of studies suggests that there is insufficient evidence for routine use of drain after colorectal surgery. Despite evidence-based data questioning prophylactic drainage of abdominal cavity in many instances, most surgeons around the world continue to use drains on a routine basis until now. There are strong evidences in literature in favor of no apparent benefit of drainage for supra-peritoneal anastomoses; however, there is still controversies regarding drainage of infra-peritoneal rectal anastomoses.