External validation of four nephrometry scores for trans-peritoneal robotic partial nephrectomy

Bhavan Prasad Rai, Amit Patel, Ahmed Abroaf, Narin Suleyman, Shanmugasundaram Gowriemohan, Venkat Prasad, Nikhil Vasdev, Jim Adshead

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Introduction External validation of four nephrometry scores (NS): Centrality index (C-index), arterial based complexity (ABC), preoperative aspects and dimensions used for an anatomical (PADUA) and radius expohytic/endophytic nearness anterior/posterior location (RENAL) scoring systems in patients who have undergone trans-peritoneal robotic assisted partial nephrectomy (RAPN). Material and methods A prospective database for RAPN has been maintained. Individual NSs were performed on 3-dimensional reconstructions of MDCT/MRI studies retrospectively by a board certified uroradiologist. Univariate Cox Proportional-Hazard Regression Analysis was performed for each NSs to valuate its predictability for the following parameters: Warm Ischemia Time (WIT), Estimated Blood Loss (EBL), Operative Time (OT), Complication Rates and Positive Margin Rates. Results 78 RAPNs were performed for suspected renal malignancies. The mean OT, EBL and WIT time was 186.5 minutes (SD – 33.8), 125.5 mls (SD – 188.91) and 16.7 minutes (SD – 5.6) respectively. The overall complication rate was 20.5% (16/78) of which only 2.6% (2/78) were Clavien Grade 3 or higher complications. The mean change in creatinine change at Day – 1 was 12.54 μmol/L (SD – 18.05). On the Cox regression analysis only the Centrality index predicted prolonged WIT with statistical significance: C-Index (0.02), ABC (0.2), PADUA (0.2), RENAL (0.9). ABC predicted operative time with statistical significance: C-index (0.45), ABC (0.0004), PADUA (0.25), RENAL (0.3). None of the NSs could predict overall complication: C-index (0.5), ABC (0.2), PADUA (0.13), RENAL (0.5). None of the NSs predicted EBL: C-index (0.3)0, ABC (0.8), PADUA (0.2), RENAL (0.7). None of the NSs predicted Positive Margin Rates: C-index (0.4), ABC (0.4), PADUA (0.9), RENAL (0.8). Conclusions C-index was able to predict prolonged WIT. ABC was a strong predictor of OT. PADUA and RENAL were poor predictors for all measured parameters.

Original languageEnglish
Pages (from-to)232-237
Number of pages6
JournalCentral European Journal of Urology (CEJU)
Issue number3
Early online date29 Jun 2017
Publication statusE-pub ahead of print - 29 Jun 2017


  • ABC
  • Centrality index
  • Nephrometry scores
  • Renal
  • Robotic assisted partial nephrectomy


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