Continuous noninvasive cardiac output as estimated from the pulse contour curve
Continuous noninvasive cardiac output as estimated from the pulse contour curve
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根据脉搏轮廓曲线估计的连续无创心输出量
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
G. Larijani
中科院分区：
文献类型：
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作者：
I. Gratz;J. Kraidin;A. G. Jacobi;N. G. deCastro;P. Spagna;G. Larijani
我们开发了一种非侵入性的基于计算机的系统，用于估计连续心输出量的改进的脉搏轮廓方法，使用手指压力波形。该方法不需要个体患者校准或基线心输出量。首先，我们在一个由20名患者组成的“学习”组中校准了系统。然后在27例接受冠状动脉搭桥手术的患者中将基于计算机的心输出量与热稀释心输出量进行比较。在四个预定时间段（诱导前、诱导后、旁路前和旁路后）共进行了94次心输出量测定（每次测定平均三次）。在测定每次热稀释心输出量时，脉搏波数据同时记录在盒式磁带上。患者的心输出量范围为2.9至6.4 L/min，相关系数为0.75。平均热稀释心输出量为4.50（±0.83 SD）L/min，而根据指压波得出的心输出量为4.48（±0.7 SD）L/min（差异的95%置信区间[CI]，0-3.2%）。两种方法之间的平均差异为0.02（±0.55 SD）L/min。偏倚的95% CI为0.0001至0.036 L/min。一致性下限的95% CI为− 1.12至− 1.06 L/min; 95%CI的上限为1.09至1.16 L/min。该程序证明，可通过使用Finapres器械（Ohmeda，Boulder，CO）获得心输出量的信息。通过这种连续无创技术获得的心输出量值在87%的时间内在同步热稀释值的±20%范围内。这在心输出量的窄范围（2.9至6.4 L/min）和心率的宽范围（45至140次/min）内都是正确的。
We developed a noninvasive computer-based system for estimating continuous cardiac output by a modified pulse contour method using a finger pressure waveform. The method requires no individual patient calibration or baseline cardiac output. First, we calibrated the system in a “learn” group of 20 patients. The computer-based cardiac output was then compared with thermodilution cardiac output in 27 patients undergoing coronary artery bypass surgery. A total of 94 cardiac outputs were performed (three averaged per determination) at four predetermined time periods: preinduction, postinduction, prebypass, and postbypass. During determination of each thermodilution cardiac output, the pulse wave data were simultaneously recorded on cassette tape. The patients had cardiac outputs ranging from 2.9 to 6.4 L/min. The correlation coefficient was 0.75. The average thermodilution cardiac output was 4.50 (±0.83 SD) L/min, while the cardiac output derived from the finger pressure wave was 4.48 (±0.7 SD) L/min (95% confidence interval [CI] of difference, 0–3.2%). The mean difference between the two methods was 0.02 (±0.55 SD) L/min. The 95% CI for the bias was 0.0001 to 0.036 L/min. The 95% CI for the lower limit of agreement was − 1.12 to − 1.06 L/min; the upper limit for the 95% CI was 1.09 to 1.16 L/min. The program demonstrated that information about cardiac output can be obtained by using the Finapres device (Ohmeda, Boulder, CO). The cardiac output values obtained by this continuous noninvasive technique were within ±20% of the simultaneous thermodilution values 87% of the time. This was true over the narrow range of cardiac outputs (2.9 to 6.4 L/min) and wide range of heart rates (45 to 140 beats/min).
估计动脉总顺应性--一种改进的方法和对现有方法的评估
影响因子：
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作者：
LIU, ZR;BRIN, KP;YIN, FCP
通讯作者：
YIN, FCP