Improved reliability of impedance cardiography by new signal processing techniques

Sridhar P. Reddy, Liang-Yu Shyu, Barry E. Hurwitz, Joachim H. Nagel & Neil Schneiderman
This study used the impedance cardiogram (ICG), the phonocardiogram (pCG) and the electrocardiogram (ECG) to determine stroke volume and systolic time intervals. Comparisons between a fully automated PC-AT signal processing system and a computer-assisted visual detection processing system revealed comparable means, standard errors, correlations (Spearman r) and reliability (Chronbach's ex) coefficients on all relevant parameters. Other analyses confIrmed the utility of using Q onset to mark the beginning of ventricular systole, the B point of...
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