Laborie Medical Technologies, Mississauga, Ontario, Canada.
School of Engineering, University of Guelph, Guelph, Ontario, Canada.
Neurourol Urodyn. 2018 Feb;37(2):619-625. doi: 10.1002/nau.23342. Epub 2017 Jul 17.
Urodynamics (UDS) is widely used for the diagnosis of lower urinary tract dysfunction. Air-Charged catheters (ACC), one of the newer technologies for UDS pressure recording, has been adopted in growing numbers around the world for the past 15 years. Currently, there is a lack of published studies characterizing specific performance of the ACC. Since linearity, hysteresis, pressure drift, and frequency response are important components in characterizing accuracy for catheter-manometer systems; this study aimed to assess these four aspects in ACC.
A total of 180 T-DOC® ACC were used in three different laboratory settings to assess pressure linearity and hysteresis (15 dual-sensor vesical and urethral and 30 single-sensor abdominal), pressure drift over 2 h (115 single-sensor), and frequency response (20 single-sensor). Data are presented as mean ± standard deviation.
ACC showed linearity of 0.99 ± 0.01, 0.99 ± 0.01, and 1.01 ± 0.01; and hysteresis of 0.57 ± 0.3%, 0.76 ± 0.48%, and 1 ± 0.89% for the abdominal, vesical, and urethral sensors, respectively. A pressure drift of 2.2 ± 1.4% at 1 h and 4.4 ± 2.5% at 2 h were observed when compared to baseline pressures. The catheters did not show any amplification factor during the sweep from 1 to 30 Hz, and recorded signals up to 5 Hz attenuating higher frequency signals.
In this study the T-DOC® ACC showed a linear performance with minimal hysteresis associated with acceptable pressure drift, and adequate frequency response to capture clinically relevant pressures. The accurate results observed in this study suggest that these catheters are technically suitable to be used as a measuring instrument for UDS.
尿动力学（UDS）广泛用于诊断下尿路功能障碍。空气充注导管（ACC）是 UDS 压力记录的新技术之一，在过去 15 年中，在全球范围内越来越多地被采用。目前，缺乏对 ACC 特定性能进行描述的已发表研究。由于线性、滞后、压力漂移和频率响应是描述导管-压力计系统准确性的重要组成部分；因此，本研究旨在评估 ACC 在这四个方面的性能。
共使用 180 个 T-DOC® ACC 在三个不同的实验室环境中评估压力线性和滞后（15 个双传感器膀胱和尿道，30 个单传感器腹部）、2 小时内的压力漂移（115 个单传感器）和频率响应（20 个单传感器）。数据以平均值±标准差表示。
ACC 的线性度分别为 0.99±0.01、0.99±0.01 和 1.01±0.01；腹部、膀胱和尿道传感器的滞后度分别为 0.57±0.3%、0.76±0.48%和 1±0.89%。与基线压力相比，在 1 小时和 2 小时时观察到压力漂移分别为 2.2±1.4%和 4.4±2.5%。当从 1 到 30 Hz 进行扫频时，导管没有显示任何放大系数，并且记录的信号衰减了更高频率的信号，最高可达 5 Hz。
在这项研究中，T-DOC® ACC 表现出线性性能，滞后最小，与可接受的压力漂移相关，并且具有足够的频率响应来捕捉临床相关的压力。在这项研究中观察到的准确结果表明，这些导管在技术上适合用作 UDS 的测量仪器。
