The effect of gastric banding on kidney stone disease.
OBJECTIVE
To evaluate the likelihood of being diagnosed with, or treated for, an upper urinary tract calculus after gastric banding. Bariatric surgical procedures are being increasingly utilized in the treatment of patients with morbid obesity. Certain malabsorptive bariatric procedures have been associated with an increased risk for kidney stone formation. However, the kidney stone risk of gastric banding, a restrictive bariatric procedure, is unknown.


METHODS
We identified 201 patients who underwent gastric banding and a control group of 201 obese patients who did not have bariatric surgery in a national private insurance claims database within a 5-year period from 2002-2006. All patients had at least 2 years of continuous claims data follow-up. Our 2 primary outcomes were the diagnosis and the surgical treatment of a urinary calculus.


RESULTS
After gastric banding, the diagnosis of an upper urinary tract calculus occurred in 3 subjects (1.49%), as compared with 12 subjects (5.97%) in the comparison cohort (P = .0179). One subject in each cohort (0.50%) underwent a surgical procedure for the treatment of an upper urinary tract (P = 1.0000).


CONCLUSIONS
Gastric banding is not associated with an increased risk for kidney stone disease or kidney stone surgery in the postoperative period. Additional long-term studies are required to confirm these findings.
Semins
Michelle J
MJ
Department of Urology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.
Matlaga
Brian R
BR
Shore
Andrew D
AD
Steele
Kimberley
K
Magnuson
Thomas
T
Johns
Roger
R
Makary
Martin A
MA
D005260:Female; D015391:Gastroplasty / Q000009:adverse effects*; D006801:Humans; D007669:Kidney Calculi / Q000453:epidemiology* / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D015995:Prevalence
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