< 22 mmol/L), and proteinuria ( ≥ 1 + on dipstick testing). Multivariate logistic regression (MV) was used to identify risk factors for developing an eGFR of < 60 mL/ min/1.73 m 2 , a creatinine level of ≥ 2.0 mg/dL and MA.
RESULTSOf the 749 patients, 499 had RN and 250 NSS; there were no significant demographic differences between the groups. After surgery a significantly greater proportion of the RN than the NSS group had a low eGFR (44.7% vs 16.0%, P < 0.001), MA (12.8% vs 7.2%, P = 0.02), proteinuria (22.2% vs 13.2%, P = 0.003) and elevated creatinine (14.2% vs 8.4%, P = 0.022). MV showed that diabetes mellitus (odds ratio 8.96, P = 0.002), RN (5.32, P < 0.001), hypertension (4.55, P = 0.003), a body mass index (BMI) of ≥ 30 kg/m 2 (3.51, P = 0.017), age ≥ 60 years (2.91, P = 0.015) and smoking (2.44, P = 0.014) were risk factors for developing a low eGFR; and that age ≥ 60 years (2.00, P = 0.019), diabetes mellitus (10, P < 0.001), hypertension (7.41, P = 0.002), smoking (5.29, P < 0.001) and RN (3.08, P < 0.001) were risk factors for developing an elevated creatinine level; and that being male (2.50, P = 0.019), age ≥ 60 years (3.13, P = 0.002), a BMI ≥ 30 (3.52, P < 0.001), RN (9.82, P < 0.001), preoperative eGFR < 60 (9.71, P < 0.001) and elevated creatinine (5.9, P = 0.008) were risk factors for developing MA.
CONCLUSIONSPatients undergoing RN had significantly greater CRI, MA and proteinuria rates than a well-matched group undergoing NSS. In addition to RN, age ≥ 60 years, diabetes mellitus, hypertension and smoking were associated with progression to CRI after surgery.
KEYWORDSchronic renal insufficiency, metabolic acidosis, proteinuria, nephron-sparing surgery, radical nephrectomy, RCC Study Type -Prognosis (case series) Level of Evidence 4