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Effect of bariatric surgery on normal and abnormal renal function.

D P Schuster1, M Teodorescu, D Mikami

  • 1Division of Endocrinology and Metabolism, Department of Internal Medicine, Ohio State University Hospitals, Columbus, Ohio, USA. dara.schuster@osumc.edu

Surgery for Obesity and Related Diseases : Official Journal of the American Society for Bariatric Surgery
|January 29, 2011
PubMed
Summary

Bariatric surgery appears safe for kidney function, with most patients maintaining normal or improved serum creatinine levels two years post-operation. This suggests weight loss may positively impact renal health, potentially reducing risks associated with obesity-related comorbidities.

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Area of Science:

  • Nephrology
  • Bariatric Surgery
  • Renal Function Assessment

Background:

  • Obesity is linked to hypertension, diabetes, and metabolic syndrome, increasing chronic kidney disease (CKD) risk.
  • Obesity independently impairs renal function and accelerates renal insufficiency progression.
  • Understanding the impact of bariatric surgery on renal function is crucial for managing obesity-related comorbidities.

Purpose of the Study:

  • To evaluate the long-term effect of bariatric surgery on renal function in obese patients.
  • To assess changes in serum creatinine (CR) levels at various follow-up intervals post-surgery.
  • To determine if bariatric surgery negatively impacts renal function, particularly in patients with pre-existing renal impairment.

Main Methods:

  • Retrospective analysis of serum creatinine (CR) in 813 patients undergoing bariatric surgery.
  • Patients were followed for at least 24 months, with CR levels monitored at baseline, 6, 12, and ≥24 months.
  • Patients were stratified into groups based on baseline CR: normal (<1.3 mg/dL), mild impairment (1.3-1.6 mg/dL), and moderate impairment (>1.6 mg/dL).

Main Results:

  • In patients with normal baseline CR (<1.3 mg/dL), 100% maintained normal levels by 2 years post-surgery.
  • Among patients with mild or moderate renal impairment at baseline (CR ≥1.3 mg/dL), 76.7% showed improvement to normal CR levels by ≥2 years post-surgery.
  • Bariatric surgery did not demonstrate a negative effect on renal function, with stable or improved CR levels observed in the majority of patients.

Conclusions:

  • Bariatric surgery is associated with stable or improved renal function, as indicated by serum creatinine levels, over a 24-month follow-up period.
  • Significant improvement in renal function was observed in patients with pre-existing renal impairment (CR ≥1.3 mg/dL) post-bariatric surgery.
  • Weight loss following bariatric surgery may positively influence renal health, potentially by reducing obesity-related comorbidities like diabetes and hypertension.