Body mass index and comorbidity are associated with postoperative renal function after nephrectomy

Area of Science:

• Nephrology
• Urology
• Oncology

Background:

• Nephrectomy, the surgical removal of a kidney, can impact remaining renal function.
• Assessing pre-operative factors is crucial for predicting post-operative outcomes.

Purpose of the Study:

• To investigate the relationship between body mass index (BMI) and comorbidities with renal function following nephrectomy.
• To identify predictors of renal function decline after kidney surgery.

Main Methods:

• Retrospective analysis of 263 patients undergoing partial or radical nephrectomy (2000-2013).
• Evaluated variables included BMI, Charlson Comorbidity Index (CCI), and surgical approach.
• Estimated glomerular filtration rate (GFR) using the Cockroft-Gault equation; logistic regression analysis performed.

Main Results:

• A significant decline in renal function (≥25%) was associated with higher BMI (OR 1.07), CCI (OR 1.19), and radical nephrectomy (OR 3.09).
• Median GFR decreased from 86.2 mL/min/1.73 m² preoperatively to 68.4 mL/min/1.73 m² postoperatively.

Conclusions:

• BMI and CCI are significant factors associated with reduced renal function after nephrectomy.
• Radical nephrectomy leads to a greater decline in renal function compared to partial nephrectomy.
• Preoperative assessment of patient comorbidity is vital for surgical decision-making in renal mass cases.