Please use this identifier to cite or link to this item: http://dx.doi.org/10.18419/opus-7169
Authors: Hurwitz, Barry E.
Shyu, Liang-Yu
Reddy, Sridhar P.
Schneiderman, Neil
Nagel, Joachim H.
Title: Coherent ensemble averaging techniques for impedance cardiography
Issue Date: 1990
metadata.ubs.publikation.typ: Konferenzbeitrag
metadata.ubs.publikation.source: Proceedings / Third annual IEEE Symposium on Computer-Based Medical Systems : June 3 - 6, 1990, University of North Carolina at Chapel Hill. Los Alamitos, Calif. : IEEE Computer Society Pr., 1990, S. 228-235
URI: http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-52127
http://elib.uni-stuttgart.de/handle/11682/7186
http://dx.doi.org/10.18419/opus-7169
Abstract: EKG synchronized ensemble averaging of the impedance cardiogram tends to blur or suppress signal events due to signal jitter or event latency variability. Although ensemble averaging provides some improvement in the stability of the signal and signal to noise ratio under conditions of nonperiodic influences of respiration and motion, coherent averaging techniques were developed to determine whether further enhancement of the impedance cardiogram could be obtained. Physiological signals were obtained from sixteen male and female subjects during resting conditions, while delivering a speech and while undergoing submaximal bicycle exercise. Results indicated that improved resolution of dZ/dt signal events could be obtained using coherent ensemble averaging. Although some improvement in precision of event location was obtained, most enhancement of the impedance cardiogram occurred in measurement of the amplitude of the dZ/dt maximum (ejection velocity) during speaking and exercise conditions. Validated increases in dZ/dt maximum exceeding 20% were obtained in some subjects with coherent averaging, suggesting that the diagnostic utility of impedance cardiography can be improved by using this technique.
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