There several advantages to sleeve and bypass over band. The restriction from sleeve and bypass is better tolerated, both show better resolution of medical problems over band, and both have more consistent outcomes compared to band. When deciding between sleeve vs bypass the benefit of each should be discussed by the surgeon as well as the risk. Bmi greater than 50, diabetics taking insulin, and patients with bad reflux and large hiatal hernia do Better with bypass. Patients with history of bowel resection, very bad anemias or complicated history of kidney stones may not be good candidates for bypass. Lower bmi (35-50) are also usually good candidates for bypass but the advantages are limited to better control of diabetes and more long term data substantiating durability of result. The two operations have about the same risk, although there are articles that vary on the topic.
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