Bariatric surgery using the Roux-en-Y gastric bypass (RYGB) procedure increases the risk of kidney stones, whereas restrictive procedures decrease the risk, according to a systematic review and meta-analysis published in Renal Failure (2016; online ahead of print).

Charat Thongprayoon, MD, of Mayo Clinic in Rochester, Minn., and colleagues analyzed data from 4 studies that included 11,348 participants. Bariatric surgery overall was associated with a 22% increased pooled relative risk (RR) of kidney stones versus no surgery. RYGB, however, was associated with a 73% increased pooled RR of kidney stones, but restrictive procedures such as laparoscopic banding or sleeve gastrectomy were associated with a 63% decreased pooled RR.

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