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  • Research Article
  • 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

  • Received: 26 April 2006
  • Accepted: 11 January 2007
  • Published:


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.


  • Ischemia
  • Temporal Pattern
  • Physiologic Mechanism
  • Distinct Population
  • Diurnal Change

Authors’ Affiliations

Faculty of Computer and Information Science, University of Ljubljana, Ljubljana, 1000, Slovenia


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© A. Smrdel and F. Jager 2007