Ultrasonic and nonultrasonic instrumentation: a systematic review and meta-analysis.

To compare the efficacy and safety of ultrasonic surgical instrumentation with nonultrasonic traditional surgical techniques in various types of surgery.Electronic searches of MEDLINE, Current Contents, and the Cochrane Library were performed for the period of 1990 to June 1, 2005, using relevant search terms. A manual check of all references in accepted studies was also performed.Only comparative studies (including randomized and nonrandomized control trials) of ultrasonic surgical instrumentation with nonultrasonic instrumentation were accepted. Procedures of interest included the following: colorectal surgery, gynecologic surgery, head and neck surgery, solid organ surgery, vessel harvesting, cholecystectomy, hemorrhoidectomy, mastectomy, and Nissen fundoplication.Two investigators reviewed each study: the first investigator extracted all relevant data, and consensus of each extraction was performed by a second investigator to verify the data. Data were then entered into a database and quality checked for accuracy.Fifty-one primary studies that examined 4902 patients were included in this systematic review, of which 24 were randomized trials and 27 were nonrandomized studies. Comparative meta-analyses for blood loss, surgery time, and hospital length of stay were performed using a random-effects model and stratified by surgery type. Heterogeneity was tested using Q statistics. Statistical significance was defined as P < .05.Meta-analysis of outcomes comparing ultrasonic with conventional nonultrasonic surgical instrumentation demonstrates significant improvement of several perioperative outcomes in procedure-specific settings when ultrasonic instrumentation is used.