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The Learning Curve for Flank Percutaneous Nephrolithotomy for Kidney Calculi: A Single Surgeon's Experience

 Won Sik Jang  ;  Kyung Hwa Choi  ;  Seung Choul Yang  ;  Woong Kyu Han 
 KOREAN JOURNAL OF UROLOGY, Vol.52(4) : 284-288, 2011 
Journal Title
Issue Date
Kidney calculi ; Learning curve ; Percutaneous nephrolithotomy
PURPOSE: Percutaneous nephrolithotomy (PCNL) is conventionally conducted in the prone position. However, the prone position increases anesthesia-related morbidity and position changes lengthen the operation time. We report perioperative outcomes and the learning curve for flank PCNL on the basis of a single surgeon's experience. MATERIALS AND METHODS: This study investigated 53 cases of flank PCNL performed for renal stones at our institution from April 2008 to September 2010. We compared mean operative time, stone-free rate, drop in hemoglobin level, length of hospital stay, complications, and need for additional procedures after the surgery. The 53 cases were divided into three groups by case number to compare therapeutic effect, stability, and the learning curve for flank position PCNL. RESULTS: The mean operation time for the 53 patients was 97.3+/-43.1 minutes. The mean operation time gradually decreased as the surgeon accumulated experience. From the 36th case, the mean operation time showed a statistically significant decrease to 72.2+/-24.1 minutes (p=0.003). The overall stone-free rate was 64.2% for all procedures (range, 61.1-76.5%). There were no significant differences in the drop in hemoglobin level, stone-free rate, re-treatment, hospital stay, or complication rate. There was no injury to the bowel or renal vessels, and no other major complications occurred. CONCLUSIONS: Flank PCNL can be used to remove renal stones effectively while overcoming the disadvantages of the existing prone position PCNL. After 36 cases, the learning curve showed acquisition of surgical competence. The clinical experience reported here suggests that flank PCNL is a safe and feasible technique.
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1. College of Medicine (의과대학) > Dept. of Urology (비뇨의학교실) > 1. Journal Papers
Yonsei Authors
Yang, Seung Choul(양승철)
Jang, Won Sik(장원식) ORCID logo https://orcid.org/0000-0002-9082-0381
Choi, Kyung Hwa(최경화)
Han, Woong Kyu(한웅규) ORCID logo https://orcid.org/0000-0002-2527-4046
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