Coherent ensemble averaging techniques for impedance cardiography

Barry E. Hurwitz, Liang Yu Shyu, Sridhar P. Reddy, Neil Schneiderman, Joachim H. Nagel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

32 Scopus citations

Abstract

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 16 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 using this technique.

Original languageEnglish (US)
Title of host publicationProc Third Annu IEEE Symp Comput Based Med Syst
PublisherPubl by IEEE
Pages228-235
Number of pages8
ISBN (Print)0818690402
StatePublished - Dec 1 1990
EventProceedings of the Third Annual IEEE Symposium on Computer-Based Medical Systems - Chapel Hill, NC, USA
Duration: Jun 3 1990Jun 6 1990

Publication series

NameProc Third Annu IEEE Symp Comput Based Med Syst

Other

OtherProceedings of the Third Annual IEEE Symposium on Computer-Based Medical Systems
CityChapel Hill, NC, USA
Period6/3/906/6/90

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Hurwitz, B. E., Shyu, L. Y., Reddy, S. P., Schneiderman, N., & Nagel, J. H. (1990). Coherent ensemble averaging techniques for impedance cardiography. In Proc Third Annu IEEE Symp Comput Based Med Syst (pp. 228-235). (Proc Third Annu IEEE Symp Comput Based Med Syst). Publ by IEEE.