Open Access

Diurnal Changes of Heart Rate and Sympathovagal Activity for Temporal Patterns of Transient Ischemic Episodes in 24-Hour Electrocardiograms

EURASIP Journal on Advances in Signal Processing20072007:032386

https://doi.org/10.1155/2007/32386

Received: 26 April 2006

Accepted: 11 January 2007

Published: 22 March 2007

Abstract

We test the hypothesis that different temporal patterns of transient ST segment changes compatible with ischemia (ischemic episodes) are a result of different physiologic mechanisms responsible for ischemia. We tested the hypothesis using records of the Long-Term ST Database. Each record was divided into three intervals of records: morning, day, and night intervals; and was inserted into one of three sets according to the temporal pattern of ischemia: salvo, periodic, and sporadic pattern. We derived time- and frequency-domain parameters of the heart rate time series in selected intervals in the neighborhood of ischemic episodes. We used the adaptive autoregressive method with a recursive least-square algorithm for consistent spectral tracking of heart rate time series and to study frequency-domain sympathovagal behavior during ischemia. The results support the hypothesis that there are at least two distinct populations, which differ according to mechanisms and temporal patterns of ischemia.

Keywords

IschemiaTemporal PatternPhysiologic MechanismDistinct PopulationDiurnal Change

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Authors’ Affiliations

(1)
Faculty of Computer and Information Science, University of Ljubljana, Ljubljana, Slovenia

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Copyright

© A. Smrdel and F. Jager 2007

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