WEDNESDAY, Oct. 27 (HealthDay News) -- Obese patients who undergo gastric banding or sleeve gastrectomy to lose weight are less likely to form kidney stones after the procedure than patients who have the more invasive Roux-en-Y gastric bypass (RYGB) surgery, according to a study in the October issue of Urology.
Michelle J. Semins, M.D., of the Johns Hopkins Medical Institutions in Baltimore, and colleagues studied 18 patients who had restrictive bariatric procedures, including 14 patients with gastric banding and four with sleeve gastrectomy. The researchers evaluated 24-hour urine specimens at least six months post-procedure and compared the study group's standard kidney stone risk parameters to those of 168 normal adult non-stone-formers, 1,303 routine stone-formers, and 54 patients who had undergone RYGB, a procedure previously reported to increase kidney stone risk.
The researchers found that none of the 18 patients in the study group suffered a kidney stone during the study period. For kidney stone risk parameters, urinary oxalate excretion was significantly lower in the study group than in the RYGB group (35.4 versus 60.7 mg/d) and was not significantly different than the normal group and routine stone-formers. Other urinary parameters were not significantly different among the groups.
"Although further, confirmatory evidence is necessary, it may be that gastric banding or sleeve gastrectomy represents the preferred bariatric surgical alternative for the morbidly obese stone-former," the authors write.
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