Impedance pneumography: Noise as signal in impedance cardiography
Impedance pneumography: Noise as signal in impedance cardiography
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DOI：
10.1017/s0048577299981003
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发表时间：
1999-05-01
期刊：
影响因子：
3.7
通讯作者：
Berntson, GG
中科院分区：
文献类型：
--
作者：
Ernst, JM;Litvack, DA;Berntson, GG
胸阻抗是由呼吸周期内的事件调节的，这代表了心阻抗图中的“噪声”来源。然而，呼吸本身是心理生理学家感兴趣的一种生理节奏。我们在这里报告了基于标准的四极带电极，从心阻抗图信号中获得呼吸阻抗图测量的方法和验证。我们记录了8名健康成人在休息、起搏呼吸、腹式呼吸、胸式呼吸和心算任务中的阻抗变化(Delta Z)、阻抗变化的一阶导数(dz/dt)、应变式呼吸仪的输出和标准肺活量测定。传递函数分析表明，Delta Z(D)信号(由dz/dt信号积分得到)为所有参数(相干性、相位和增益)的标准肺活量测量提供了最佳估计，几乎占呼吸波形形态变化的90%。从标准的心阻抗心动图信号得出的结果证明了阻抗气体描记的潜在用途。
Thoracic impedance is modulated by events within the respiratory cycle, which represents a source of "noise" in impedance cardiography. Respiration itself, however, is a physiological rhythm of interest to psychophysiologists. We report here methods and validation for deriving impedance pneumographic measures of respiration from impedance cardiography signals, based on standard tetrapolar band electrodes. We recorded the change in impedance (Delta Z), the first derivative of the change in impedance (dZ/dt), output from a strain-gauge respirometer, and criterion spirometry from eight healthy adults during rest, paced breathing, abdominal breathing, thoracic breathing, and a mental arithmetic task. Transfer function analyses revealed that a Delta Z(d) Signal (derived by integration of the dZ/dt signal) provided the best estimate of the criterion spirometric measure for all parameters (coherence, phase, and gain), accounting for almost 90% of the variance in respiratory waveform morphology. The results document thr potential utility of impedance pneumography, as derived from standard impedance cardiography signals.