Symbolic dynamics of heart rate variability in myocardial ischemia
10.3760/cma.j.issn.1673-4181.2010.01.008
- VernacularTitle:心肌缺血中心率变异性的符号动力学分析
- Author:
Jing ZHANG
;
Xinya LI
;
Yi PENG
- Publication Type:Journal Article
- Keywords:
Heart rate variability;
Myocardial ischemia;
Symbolic dynamics analysis;
Autonomic nervous system
- From:
International Journal of Biomedical Engineering
2010;33(1):31-35
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the autonomic modulation and influence during myocardial ischemia based on analysis on heart rate dynamics with heart rate variability(HRV). Methods From 13 free download ECG records in long-term ST-T(LTST)database, 193 ischemia episodes were extracted for analysis, and 5 min intervals before and after each selected isehemia episode were selected as control ones. Using symbolic dynamic analysis method, the indexes during different stages were calculated. The repeated measurement analysis of variance was introduced for statistic test. And the distribution of autonomic reflex mode to isehemia duration was analyzed by linear fitting. Results Symbolic analysis detected an increase in the percentage of non-varlable patterns (0 V%) and a decrease in the percentage of very variable patterns(2 UV%), indicating a more sympathetic predominance compared with the baseline. But the trend of the shift in autonomic balance towards sympathetic predominance reduced with the extension of ischemic duration, suggesting a possible protection for heart. Conclusion Symbolic dynamic analysis is capable of identifying changes in autonomic modulation and seems appropriate for elucidating the neural pathophysiological mechanisms occurring in myocardial ischemic episodes.
