In this trial of 197 obese patients randomized to either gastric bypass or gastric banding, bypass was more effective (higher percentage of excessive weight, and lower percentage of failures), but bypass was associated with more complications (both short and long term). The risk of complications (primarily bowel obstructions and strictures) should be weighed against the risk of lower efficacy, in deciding type of obesity surgery to perform (abstract). Although these findings seem intuitive, this is the largest randomized trial to date quantifying the risks and benefits of these 2 surgical approaches.
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