Journal List > Korean J Urol > v.47(5) > 1069894

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Kim, Oh, Kim, Lee, Lee, and Chung: Frequency-Doubled Double-Pulse Nd:YAG (FREDDY) Laser for the Treatment of Ureteral Stone: Initial Experience
Original Article
Korean Journal of Urology

Korean Journal of Urology 2006; 47(5): 502-506.

Published online: 31 May 2006

DOI: https://doi.org/10.4111/kju.2006.47.5.502

Frequency-Doubled Double-Pulse Nd:YAG (FREDDY) Laser for the Treatment of Ureteral Stone: Initial Experience

Sung Soo Kim, Cheol Young Oh, Hyung Joon Kim, Seung Hwan Lee, Jae Seok Lee1, Byung Ha Chung

Department of Urology, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.

1Department of Urology, Mizmedi Hospital, Seoul, Korea.

Corresponding author (chung646@yumc.yonsei.ac.kr)

Received 12 October 2005       Accepted 12 December 2005

Copyright © 2006 The Korean Urological Association

Abstract

Purpose

We assessed the effectiveness, safety and accessibility of performing FREDDY laser lithotripsy for managing urinary tract calculi.

Materials and Methods

From January 1999 to May 2005, 173 consecutive patients underwent endoscopic lithotripsy with FREDDY laser lithotripsy. The numbers of patients, according to stone location, were 18 patients for the upper ureter, 11 for the mid ureter and 144 for the lower ureter. Patients were treated with a rigid endoscope on a day surgery basis. Patients were assessed 6 to 12 weeks postoperatively with KUB and ultrasound or excretory urography for determining the late obstructive complications.

Results

The mean stone size and mean operation time were 7.8mm and 36.6 minutes, respectively. The overall stone-free rates were 98.9%. The stone-free rates according to stone location were 100% in the upper ureter, 100% in the mid ureter and 98.6% in the lower ureter. There were no post-operative complications. Interestingly, there were no significant differences in the operation times and stone-free rates between the urologic specialists (36.7 min and 100%, respectively) and the training residents (37.1 min and 98.6%, respectively).

Conclusions

FREDDY laser lithotripsy is a highly effective and safe modality for the treatment of ureteral stone. In addition, FREDDY laser lithotripsy is very feasible for training residents.

Keywords: Ureteroscopy, Lithotripsy, Lasers, Urinary stone

Figures and Tables

Table 1
Patients' characteristics
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Table 2
Results according to the stone location
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Table 3
Comparison of results according to the operator
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Table 4
Comparison of results with the results of other laser lithotripsy
kju-47-502-i004

*include anesthesia time, †Op.: operation.

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