Outcome of Percutaneous Nephrolithotomy: Effect of Body Mass Index

By: Ahmed M. El-Assmy, Ahmed A. Shokeirlowast , Ahmed R. El-Nahas, Ahmed M. Shoma, Ibrahim Eraky, Mahmoud R. El-Kenawy and Hamdy A. El-Kappany

European Urology, Volume 52 Issue 1, July 2007, Pages 199-205

Published online: 01 July 2007

Keywords: Body mass index, Obesity, Percutaneous nephrolithotomy, Surgical outcome

Abstract Full Text Full Text PDF (125 KB)



The surgical management of renal and upper ureteral calculi presents unique challenges in obese patients. We reviewed our recent experience with percutaneous nephrolithotomy (PNL) in obese patients to determine the safety and outcome of this procedure in such group of patients.

Patients and methods

The surgical records of 1121 patients treated with PNL between 2000 and 2004 were reviewed. Patients were stratified into four groups according to the World Health Organization classification of body mass index (BMI): <25 (average), 25–29.9 (overweight), 30–39.9 (obese), and >40 kg/m2 (morbidly obese). The outcomes of PNL in these four groups were compared.


A total of 1287 procedures were performed on 1155 renal units (1.1 procedures per renal unit). The overall stone-free rate was 85.1% and the mean hospital stay was 3.3 ± 2.6 d. Major complications were seen in 72 patients (6.4%). No statistically significant differences were found in decrease in haemoglobin concentration, hospital stay, and complication rate among the four study groups. The need for auxiliary procedures and stone-free rates were comparable.


PNL in obese and morbidly obese patients yields a stone-free rate that is comparable to that achieved in nonobese patients. The complication rate and length of hospital stay are also similar.

Take Home Message

The outcome of percutaneous nephrolithotomy (PNL) is independent of the patient’s body mass index. PNL in obese patients yields a stone-free rate comparable to that in nonobese ones. The complication rate, need for auxiliary procedures, and hospital stay are similar.

Keywords: Body mass index, Obesity, Percutaneous nephrolithotomy, Surgical outcome.


Urology & Nephrology Center, Mansoura University, Mansoura, Egypt

Corresponding author. Mansoura Urology and Nephrology Center, Mansoura, Egypt. Tel. +20 50 226 2222; Fax: +20 50 226 3717.

Place a comment

Your comment *

max length: 5000