Robotic Versus Laparoscopic Partial Nephrectomy for Complex Tumors: Comparison of Perioperative Outcomes

Abstract

BackgroundRecent studies showed that robotic partial nephrectomy (RPN) offered outcomes at least comparable to those of laparoscopic partial nephrectomy (LPN). LPN can be particularly challenging for more complex tumors. ObjectiveTo compare the perioperative outcomes of patients undergoing LPN or RPN for a single renal mass of moderate or high complexity. Design, setting, and participantsA retrospective analysis was performed for 381 consecutive patients who underwent either LPN (n=182) or RPN (n=199) between 2005 and 2011 for a complex renal mass (RENAL score ≥7). Perioperative outcomes were compared. Predictors of postoperative renal function were assessed using multivariable linear regression analysis. InterventionLPN or RPN. Outcome measurements and statistical analysisPerioperative outcomes were compared. Predictors of postoperative renal function were assessed using multivariable linear regression analysis. Results and limitationsThere was no significant difference between the two groups with respect to patient age, gender, side, American Society of Anesthesiologists score, Charlson comorbidity index (CCI), or tumor size. Patients undergoing LPN had a slightly lower body mass index (29.2kg/m2 compared with 30.7kg/m2, p=0.02) and preoperative estimated glomerular filtration rate (eGFR) (81.1 compared with 86.0ml/min per 1.73 m2, p=0.02). LPN was associated with an increased rate of conversion to radical nephrectomy (RN) (11.5% compared with 1%, p<0.001) and a higher decrease in percentage of eGFR (−16.0% compared with −12.6%, p=0.03). There were no significant differences with respect to warm ischemia time (WIT), estimated blood loss, transfusion rate, or postoperative complications. WIT, preoperative eGFR, and CCI were found to be predictors of postoperative eGFR in multivariable analysis. No difference in perioperative outcomes was found between moderate and high RENAL score subgroups. The retrospective study design was the main limitation of this study. ConclusionsRPN provides functional outcomes comparable to those of LPN for moderate- to high-complexity tumors, but with a significantly lower risk of conversion to RN. This situation is likely because of the technical advantages offered by the articulated robotic instruments. A prospective randomized study is needed to confirm these findings.