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 language | English |
|---|---|
| Title of host publication | Unknown Host Publication Title |
| Place of Publication | Piscataway, NJ, United States |
| Publisher | Publ by IEEE |
| Pages | 228-235 |
| Number of pages | 8 |
| ISBN (Print) | 0818690402 |
| State | Published - Dec 1 1990 |
| Event | Proceedings of the Third Annual IEEE Symposium on Computer-Based Medical Systems - Chapel Hill, NC, USA Duration: Jun 3 1990 → Jun 6 1990 |
Other
| Other | Proceedings of the Third Annual IEEE Symposium on Computer-Based Medical Systems |
|---|---|
| City | Chapel Hill, NC, USA |
| Period | 6/3/90 → 6/6/90 |
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ASJC Scopus subject areas
- Engineering(all)
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - Coherent ensemble averaging techniques for impedance cardiography
AU - Hurwitz, Barry
AU - Shyu, Liang Yu
AU - Reddy, Sridhar P.
AU - Schneiderman, Neil
AU - Nagel, Joachim H.
PY - 1990/12/1
Y1 - 1990/12/1
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=0025625437&partnerID=8YFLogxK
M3 - Conference contribution
SN - 0818690402
SP - 228
EP - 235
BT - Unknown Host Publication Title
PB - Publ by IEEE
CY - Piscataway, NJ, United States
ER -