A new impedance cardiograph device for the non-invasive evaluation of cardiac output at rest and during exercise: comparison with the "direct" Fick method
A new impedance cardiograph device for the non-invasive evaluation of cardiac output at rest and during exercise: comparison with the "direct" Fick method
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DOI：
10.1007/s004210000226
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发表时间：
2000-07-01
影响因子：
3
通讯作者：
Lonsdorfer, J
中科院分区：
文献类型：
--
作者：
Charloux, A;Lonsdorfer-Wolf, E;Lonsdorfer, J
本研究的目的是评价一种新的阻抗心电图仪设备Physio Flow在休息时和仰卧位进行稳态动态腿部运动（工作强度范围为10 - 50 W）期间的可靠性和准确性。我们比较了通过两种方法同时测定的心输出量，即Physio Flow（（Q）over dot cPF）和直接Fick（（Q）over dot cFick）方法。40例右心导管插入术患者，14例睡眠呼吸暂停综合征和26例慢性阻塞性肺疾病，参加了这项研究。受试者的耗氧量值范围为0.14至1.19 1。min（-1）两种方法之间的平均差（（Q）对点cFick -（Q）对点cPF）为0.04 1。min（-1）和0.29 1 . min（-1）。定义为平均差+/-2SD的一致性限度为-1.34，± 1.411。min（-1），静息时为-2.34，+2.921. min（-1）。两种方法之间的差异超过20%的情况下，只有2.5%的休息，9.3%的情况下，在运动。胸部过度充气在点cPF上没有改变（Q）。我们得出结论，Physio Flow提供了这些条件下临床可接受的心输出量无创评价。这种新的阻抗心动图设备值得进一步研究，使用其他人群和情况。
The objectives of this study were to evaluate the reliability and accuracy of a new impedance cardiograph device, the Physio Flow, at rest and during a steady-state dynamic leg exercise (work intensity ranging from 10 to 50 W) performed in the supine position. We compared cardiac output determined simultaneously by two methods, the Physio Flow ((Q) over dot cPF) and the direct Fick ((Q) over dot cFick) methods. Forty patients referred for right cardiac catheterisation, 14 with sleep apnoea syndrome and 26 with chronic obstructive pulmonary disease, took part in this study. The subjects' oxygen consumption values ranged from 0.14 to 1.19 1 . min(-1) The mean difference between the two methods ((Q) over dot cFick - (Q) over dot cPF) was 0.04 1 . min(-1) at rest and 0.29 1 . min(-1) during exercise. The limits of agreement, defined as mean difference +/- 2SD, were -1.34, + 1.41 1 . min(-1) at rest and -2.34, + 2.92 1 . min(-1) during exercise. The difference between the two methods exceeded 20% in only 2.5% of the cases at rest, and 9.3% of the cases during exercise. Thoracic hyperinflation did not alter (Q) over dot cPF. We conclude that the Physio Flow provides a clinically acceptable and non-invasive evaluation of cardiac output under these conditions. This new impedance cardiograph device deserves further study using other populations and situations.