Evaluation of dynamic performance in liquid-filled catheter systems for measuring invasive blood pressure
Evaluation of dynamic performance in liquid-filled catheter systems for measuring invasive blood pressure
复制标题
用于测量有创血压的液体填充导管系统的动态性能评估
DOI：
10.1023/a:1016903508976
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
C. Thøgersen
中科院分区：
文献类型：
--
作者：
M. Todorović;E. Jensen;C. Thøgersen
有创血压测量用于血流动力学不稳定的患者。这些测量的精度要求很高。再现信号的可靠性很大程度上取决于测量系统的动态特性——谐振频率和阻尼系数。用频率响应法对这些特性进行了检验，这对二阶和高阶系统是有价值的。在临床实践中使用的大多数压力测量系统具有低阻尼系数（0.1-0.2），这会导致收缩压值的高超调（高达13%），因为将所有测量组件放在一个链中会降低单个组件的动态特性，并且共振频率从100 Hz以上急剧下降到甚至低于10 Hz。增加阻尼比的解决方案之一是在油管上平行插入一个阻尼装置R.O.S.E.。共振频率保持不变，阻尼系数增大到0.5左右。具有较高阻尼系数（0.5-0.7）的系统具有较低的超调（1-2%），因此血压测量更准确。
Invasive blood pressure measurement is used in patients with unstable haemodynamics. The demand of the accuracy of these measurements is high. The reliability of the reproduced signal strongly depends on the measurement system's dynamic characteristic—its resonance frequency and damping factor. These characteristics were examined with the frequency response method, which is valuable for second and higher order systems. Most of the pressure measuring systems in use in clinical practice have low damping factor (0.1–0.2), which causes high overshoot in systolic pressure values (up to 13%), since putting all the measuring components in a chain reduces the dynamic properties of a single component and the resonance frequency drops drastically from over 100 Hz to even below 10 Hz. One of the solutions to increase the damping ratio is to insert a damping device R.O.S.E. parallel to the tubing. The resonance frequency remains the same, the damping factor increases to around 0.5. Systems with higher damping factors (0.5–0.7) have lower overshoot (1–2%), therefore the blood pressure measurements are more accurate.