Pickett B R, Buell J C
Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock 79430.
Am J Cardiol. 1992 May 15;69(16):1354-8. doi: 10.1016/0002-9149(92)91235-v.
The accuracy and reproducibility of noninvasive cardiac output determinations by computer-averaged impedance cardiography were compared with those of simultaneously performed thermodilution cardiac output. In all, 43 patients (14 men and 29 women = 201 pairs) were studied by simultaneously performed impedance and thermal determinations. Individual impedance values correlated with paired thermodilution determinations (r = 0.75; p less than 0.0001). Each patient's average thermodilution values correlated with the average impedance values (r = 0.86; p less than 0.0001). Mean thermodilution output was 4.6 +/- 1.37 liters/min. Mean impedance output was 4.5 +/- 1.27 liter/min Reproducibility was comparable for impedance (0.0059 +/- 0.639) and thermodilution cardiac output (0.023 +/- 0.556). There was high agreement between methods by plot of the difference against mean of the 2 methods. Impedance cardiac output values agree and correlate highly with quality-controlled thermodilution outputs across a wide range of clinical conditions and hemodynamic values.
通过计算机平均阻抗心动图测定无创心输出量的准确性和可重复性，与同时进行的热稀释法心输出量测定结果进行了比较。共有43例患者（14名男性和29名女性，共201对）接受了阻抗和热稀释同步测定研究。个体阻抗值与配对的热稀释测定值相关（r = 0.75；p < 0.0001）。每位患者的平均热稀释值与平均阻抗值相关（r = 0.86；p < 0.0001）。平均热稀释心输出量为4.6±1.37升/分钟。平均阻抗心输出量为4.5±1.27升/分钟。阻抗（0.0059±0.639）和热稀释心输出量（0.023±0.556）的可重复性相当。通过绘制两种方法差值与均值的关系图，发现两种方法之间具有高度一致性。在广泛的临床情况和血流动力学值范围内，阻抗心输出量值与质量控制的热稀释输出量相符且高度相关。
