Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Via Di Rudini 9, Milan, Italy; Department of Health Sciences, University of Milan, Milano, Italy; Coordinated Research Center on Respiratory Failure, University of Milan, Milan, Italy.
Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Via Di Rudini 9, Milan, Italy.
J Crit Care. 2022 Feb;67:21-25. doi: 10.1016/j.jcrc.2021.09.009. Epub 2021 Oct 6.
The mechanical power (MP) is the energy delivered into the respiratory system over time. It can be computed as a direct measurement of the inspiratory area of the airway pressure and volume loop during the respiratory cycle or calculated by "power equations". The absence of a bedside computation limited its widespread use. Recently, it has been developed an automatic monitoring system inside of a mechanical ventilator.
Our aim was to investigate the repeatability and the accuracy of the measured MP at different PEEP values and tidal volume compared with the calculated MP.
MP was measured and calculated in sedated and paralyzed ARDS patients at low and high tidal volume, at 5-10-15 cmHO of PEEP both in volume and pressure-controlled ventilation. The same measurements were performed twice.
Fifty ARDS patients were enrolled. MP was measured and calculated for a total of 300 measurements. The bias and limits of agreement were 0.38 from -1.31 to 2.0 J/min. The measured and calculated MP were similar in each ventilatory condition.
The mechanical power measured by a new automatic real time system implemented in a mechanical ventilator was repeatable and accurate compared with the computed one.
机械功率（MP）是指在一段时间内输送到呼吸系统的能量。它可以通过直接测量呼吸周期中气道压力和容积环的吸气面积来计算，也可以通过“功率方程”来计算。由于缺乏床边计算，其应用受到限制。最近，一种机械呼吸机内的自动监测系统已经开发出来。
我们的目的是研究在不同呼气末正压（PEEP）值和潮气量下，与计算的 MP 相比，测量的 MP 的可重复性和准确性。
在低和大潮气量、5-10-15 cmHO 的 PEEP 下，对镇静和麻痹的 ARDS 患者进行了 MP 的测量和计算，分别在容量控制和压力控制通气下进行。进行了两次相同的测量。
共纳入 50 例 ARDS 患者。共进行了 300 次测量，测量的和计算的 MP。测量的和计算的 MP 在每种通气条件下都相似。
与计算的 MP 相比，机械呼吸机内新的自动实时系统测量的机械功率具有可重复性和准确性。
