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Roux-en-Y Weight Loss Surgery Raises Kidney Stone Risk BALTIMORE, Md -- June 17, 2009 -- The most popular type of gastric bypass surgery, Roux-en-Y, appears to nearly double the chance that a patient will develop kidney stones, despite earlier assumptions that it would not, according to a study published in the June issue of the Journal of Urology. The overall risk, however, remains fairly small at about 8%. While other bariatric procedures have been shown to decrease calcium absorption and increase the risk of kidney stones, doctors have long assumed that the Roux-en-Y procedure did not. To test the assumption, Brian Matlaga, MD, Johns Hopkins University School of Medicine, and the James Buchanan Brady Urological Institute, Baltimore, Maryland, and colleagues used an insurance claims database to identify 4,639 patients who had undergone Roux-en-Y surgery between 2002 and 2006. The researchers identified a second set of 4,639 patients who had similar characteristics including age, gender, and body mass indices that indicate obesity but not the surgery. Using medical information encoded in the database for both patient populations, the researchers looked to see which patients were either diagnosed with kidney stones or had treatment for this condition. Results showed that while only 8% of the Roux-en-Y patients developed kidney stones, they were nearly twice as likely to get this condition compared with patients who had similar characteristics and did not have the weight loss surgery. “Our study is not an indictment of bariatric surgery -- the benefits of this surgery are well known,” said Dr. Matlaga. “Rather, we’d like to help physicians understand that their bariatric patients could be at risk for kidney stones, a condition that could be avoidable with proper preventative care.” Physicians may be able to help patients avoid kidney stones through calcium supplements or other interventions. SOURCE: Johns Hopkins Medical Institutions E-mail this page to a friend or colleague! To print, use this version