Coherent ensemble averaging techniques for impedance cardiography

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

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

31 Citations (Scopus)

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
Title of host publicationUnknown Host Publication Title
Place of PublicationPiscataway, NJ, United States
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

Other

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

Fingerprint

Cardiography
Exercise equipment
Signal to noise ratio

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Hurwitz, B., Shyu, L. Y., Reddy, S. P., Schneiderman, N., & Nagel, J. H. (1990). Coherent ensemble averaging techniques for impedance cardiography. In Unknown Host Publication Title (pp. 228-235). Piscataway, NJ, United States: Publ by IEEE.

Coherent ensemble averaging techniques for impedance cardiography. / Hurwitz, Barry; Shyu, Liang Yu; Reddy, Sridhar P.; Schneiderman, Neil; Nagel, Joachim H.

Unknown Host Publication Title. Piscataway, NJ, United States : Publ by IEEE, 1990. p. 228-235.

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

Hurwitz, B, Shyu, LY, Reddy, SP, Schneiderman, N & Nagel, JH 1990, Coherent ensemble averaging techniques for impedance cardiography. in Unknown Host Publication Title. Publ by IEEE, Piscataway, NJ, United States, pp. 228-235, Proceedings of the Third Annual IEEE Symposium on Computer-Based Medical Systems, Chapel Hill, NC, USA, 6/3/90.
Hurwitz B, Shyu LY, Reddy SP, Schneiderman N, Nagel JH. Coherent ensemble averaging techniques for impedance cardiography. In Unknown Host Publication Title. Piscataway, NJ, United States: Publ by IEEE. 1990. p. 228-235
Hurwitz, Barry ; Shyu, Liang Yu ; Reddy, Sridhar P. ; Schneiderman, Neil ; Nagel, Joachim H. / Coherent ensemble averaging techniques for impedance cardiography. Unknown Host Publication Title. Piscataway, NJ, United States : Publ by IEEE, 1990. pp. 228-235
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