***TASK***
the task is to simplify the input abstract of a biomedical literature

***INPUT***
the input is the abstract of a biomedical literature

***OUTPUT***
the output is the simplified abstract for the input abstract of a biomedical literature

***DOCUMENTATION***

***EXAMPLES***

Input: We included four RCTs involving 438 patients (220 patients in the drain group and 218 in the no-drain group). There was no evidence of a difference between the two groups in mortality (RR 1.73, 95% CI 0.38 to 7.84); re-operations (RR 2.49, 95% CI 0.71 to 8.74); post-operative complications (pneumonia: RR 1.18, 95% CI 0.55 to 2.54; wound infection: RR 1.23, 95% CI 0.47 to 3.23; intra-abdominal abscess: RR 1.27, 95% CI 0.29 to 5.51; anastomotic leak: RR 0.93, 95% CI 0.06 to 14.47); or initiation of soft diet (MD 0.15 days, 95% CI -0.07 to 0.37). However, the addition of a drain prolonged the operation time (MD 9.07 min, 95% CI 2.56 to 15.57) and post-operative hospital stay (MD 0.69 day, 95% CI 0.18 to 1.21) and led to drain-related complications. Additionally, we should note that 30-day mortality and re-operations are very rare events and, as a result, very large numbers of patients would be required to make any sensible conclusions about whether the two groups were similar. The overall quality of the evidence according to the GRADE approach was 'very low' for mortality and re-operations, and 'low' for post-operative complications, operation time, and post-operative length of stay. We found no convincing evidence to support routine drain use after gastrectomy for gastric cancer.
Output:

This review included four RCTs involving 438 patients that investigated the benefits and harms of routine abdominal drainage post-gastrectomy for gastric cancer. There was no evidence of a difference between the two groups in deaths, post-operative complications, and initiation of a soft diet. The results showed that drains increased harms by prolonging operation time and post-operative hospital stay, and led to drain-related complications without providing any additional benefit for patients with gastric cancer undergoing gastrectomy. There was no convincing evidence to support the routine use of drains after gastrectomy for gastric cancer. The overall quality of the evidence according to the GRADE approach was 'very low' for deaths and re-operations, and 'low' for post-operative complications, operation time, and post-operative length of stay. This review included only four RCTs, and not all of the included studies reported all outcomes that we were assessing. Therefore, the quality was mainly limited by insufficient data.