Does sheath size matter: benchtop comparison of flow and pressure across variety of continuous flow endoscopes.

IF 2.8 2区 医学 Q2 UROLOGY & NEPHROLOGY World Journal of Urology Pub Date : 2024-10-10 DOI:10.1007/s00345-024-05270-0
Vishnuvardhan Ganesan, Michael Borofsky, Deepak Agarwal
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Abstract

Introduction: Laser enucleation utilizes purpose-built endoscopes for laser stabilization and continuous flow. No evaluation has been done with respect to flow or intravesical pressure with these scopes. We sought to evaluate the effect different endoscopes and sheath sizes on irrigation outflow and intravesical pressure.

Methods: Using a benchtop model using a silicone bladder model, five outer/inner sheath combinations were assessed: Storz 28/26Fr, Storz 26/26Fr, Wolf 26/24Fr, Wolf 26/22Fr, and Wolf 24/22Fr. A urodynamics pressure transducer was inserted alongside the scope for bladder pressure measurement and outflow from scope to drain was measured using uroflowmetry device. Four 1-minute trials were recorded for each sheath and the steady state flow and pressure was recorded.

Results: The Storz 28 F outer sheath and 26 F inner sheath had the highest outflow (12.4 ± 0.5 mL/s, p < 0.01). The Wolf 24 F outer and 22 F inner had the lowest outflow (7.0 ± 0.0 mL/s, p < 0.01). The steady state bladder pressure was the lowest in the Storz 28/26 (1.5 ± 1.7 cm H2O, p < 0.01)) and the greatest in the Storz 26/26 (24.2 ± 1.9 cm H2O, p < 0.01).

Conclusion: The Storz 28/26 combination had best outflow rate and lowest intravesical pressures in our benchtop study. Flow rates generally decreased with smaller sheath sizes and steady state bladder pressures increased as the difference between the outflow and inflow sheath size narrowed. These findings provide initial parameters that could guide sheath selection in future to optimize visualization and success of voiding trials.

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鞘的尺寸是否重要:对各种连续流内窥镜的流量和压力进行台式比较。
简介激光去核术利用特制的内窥镜来实现激光稳定和连续流动。目前尚未对这些内窥镜的流量或膀胱内压进行评估。我们试图评估不同内窥镜和鞘的尺寸对灌注流出量和膀胱内压的影响:方法:使用硅胶膀胱模型的台式模型,对五种外/内鞘组合进行了评估:将尿动力学压力传感器插入内窥镜旁测量膀胱压力,并使用尿流测量仪测量从内窥镜到引流管的流出量。对每种鞘管进行了四次 1 分钟试验,并记录了稳态流量和压力:结果:Storz 28 F 外鞘和 26 F 内鞘的外流率最高(12.4 ± 0.5 mL/s,p):在我们的台式研究中,Storz 28/26 组合具有最佳的流出率和最低的膀胱内压。随着流出鞘和流入鞘尺寸差的缩小,流速普遍降低,稳态膀胱压力增加。这些发现提供了初步参数,可指导今后的鞘管选择,以优化可视化和排尿试验的成功率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
World Journal of Urology
World Journal of Urology 医学-泌尿学与肾脏学
CiteScore
6.80
自引率
8.80%
发文量
317
审稿时长
4-8 weeks
期刊介绍: The WORLD JOURNAL OF UROLOGY conveys regularly the essential results of urological research and their practical and clinical relevance to a broad audience of urologists in research and clinical practice. In order to guarantee a balanced program, articles are published to reflect the developments in all fields of urology on an internationally advanced level. Each issue treats a main topic in review articles of invited international experts. Free papers are unrelated articles to the main topic.
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