A meta analysis of randomized controlled trials of laparoscopic versus conventional appendectomy

BACKGROUND: Despite many randomized controlled trials, the merits of laparoscopic appendectomy remain unclear. A meta-analysis may provide insights not evident from any individual studies. DATA SOURCES: Systematic literature search yielded 17 trials (1,962 subjects) of true randomized design with usable statistical data comparing laparoscopic and conventional appendectomy in adults. The effect sizes for operating time, hospitalization, postoperative pain, return to normal activity, wound infection, and intra-abdominal abscess were calculated, using the random effects model to allow for heterogeneity. An estimate of the robustness of all positive findings was also calculated. RESULTS: Modest but statistically significant effect sizes were found for four of the six outcome measures. Laparoscopic appendectomy takes 31% longer to perform, but results in less post-operative pain, faster recovery (by 35%), and lower wound infection rates (by 60%). CONCLUSION: Laparoscopic appendectomy offers significant improvement in postoperative outcomes at the cost of a longer operation. (C) 1999 by Excerpta Medica, Inc.