Effect of bariatric surgery on normal and abnormal renal function.

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.