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The impact of chronic kidney disease on bariatric perioperative outcome: a MBSAQIP matched analysis.

BACKGROUND: Morbid obesity is considered a strong independent risk factor for chronic kidney disease (CKD), and bariatric surgery remains the most effective treatment for obesity-related co-morbidities. Previous large database analyses have suggested that CKD does not independently increase the risk of adverse outcomes after bariatric surgery. The safety of elective bariatric surgery in this patient population remains unclear. To this end, we compared 30-day outcomes in this patient population after laparoscopic sleeve gastrectomy or Roux-en-Y gastric bypass.

OBJECTIVES: To compare 30-day outcomes in CKD patients after laparoscopic sleeve gastrectomy or gastric bypass.

SETTING: University Hospital, United States.

METHODS: Using the Metabolic and Bariatric Surgery Accreditation Quality Improvement Program database, we identified patients with CKD who underwent laparoscopic sleeve gastrectomy or Roux-en-Y gastric bypass in 2015 or 2016. An unmatched cohort analysis, a propensity-matched analysis, and a case-control, matched-cohort analysis was performed of patients with and without CKD.

RESULTS: Of the 302,092 patients included in this study, 2362 (.7%) had CKD, of whom 837 (35.4%) required dialysis. CKD patients were older with significantly higher rates of co-morbid conditions. Hospital length of stay, intensive care unit admission, reoperation, readmission, bleeding, cardiopulmonary, infectious complications, and total morbidity were significantly higher in CKD patients. In propensity-matched and case-control matched analyses of 4006 patients and 2264 patients, respectively, poorer outcomes in CKD patients highlight it an independent risk factor for morbidity.

CONCLUSIONS: In contrast to previously reported large database analysis, CKD and dependence on dialysis independently increases the risk of 30-day adverse outcomes after primary bariatric surgery. The benefits conferred by bariatric surgery should be carefully weighed against the increased risk of complications in this challenging population.

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