The Learning Curve for Flank Percutaneous Nephrolithotomy for Kidney Calculi: A Single Surgeon’s Experience
장원식, 최경화, 양승철, 한웅규,
소속 상세정보
장원식 ( Jang Won-Sik )
Yonsei University Health System Urological Science Institute Department of Urology
최경화 ( Choi Kyung-Hwa )
Yonsei University Health System Urological Science Institute Department of Urology
양승철 ( Yang Seung-Choul )
Yonsei University Health System Urological Science Institute Department of Urology
한웅규 ( Han Woong-Kyu )
Yonsei University Health System Urological Science Institute Department of Urology
KMID : 0358320110520040284
Abstract
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.
키워드
Kidney calculi; Learning curve; Percutaneous nephrolithotomy
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