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Pre-ictal heart rate variability assessment of epileptic seizures by means of linear and non-linear analyses [Anatol J Cardiol]
Anatol J Cardiol. 2013; 13(8): 797-803 | DOI: 10.5152/akd.2013.237  

Pre-ictal heart rate variability assessment of epileptic seizures by means of linear and non-linear analyses

Soroor Behbahani1, Nader Jafarnia Dabanloo1, Ali Motie Nasrabadi2, Cesar A. Teixeira3, Antonio Dourado3
1Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran-Iran
2Department of Biomedical Engineering, Shahed University, Tehran-Iran
3Center of Informatics and Systems (CISUC), University of Coimbra, Coimbra-Portugal

Objective: The purpose of the present study was to analyze the effects of epilepsy on the autonomic control of the heart in pre-ictal phase in order to find an algorithm of early detection of seizure onset. Methods: Overall 133 epileptic seizures were analyzed from 12 patients with epilepsy (seven males and five females; mean age 43.91 years, SD: 10.16) participated in this study. Single lead electrocardiogram recordings of epileptic patients were compiled. 240, 90-30, 30-10 and 5 minutes heart rate variability (HRV) signals of preseizure were chosen for analysis of heart rate. As HRV signals are non-stationary, a set of time and frequency domain features (Mean HR, Triangular Index, LF, HF, LF/HF) and nonlinear parameters (SD1, SD2 and SD2/SD1 indices derived from Poincaré plots) extracted from HRV is analyzed. Statistical analysis was performed using paired sample t-test for comparisons of the segments and differences between pre-ictal segments were evaluated by Tukey tests. Results: There was slight tachycardia in segments near the seizure (30 minutes before: 85.3517 bpm, 5 minutes before: 119.3630.82 bpm, p=0.0207) which significantly differ from baseline in segments far from seizure (240 minutes before: 66.5211.7 bpm). Also there was significant increase in LF/HF ratio (30 minutes before: 1.10.22, 5 minutes before: 2.120.5, p=0.0332) and SD2/SD1 ratio (30 minutes before: 1.20.15, 5 minutes before: 2.030.55, p=0.0431) when compared to segments far from the seizure (240 minutes before: 0.780.24 and 0.780.14) respectively. Although there was about decrease of triangular index in segments near the seizure the percentage of decrease was not comparable to segments far from the seizure. Conclusion: Significant changes of HRV parameters in pre-ictal (5 minutes before the seizure) are obviously higher in comparison to interictal baseline. Pre-ictal significant changes of HRV suggesting that this time can be considered as prediction time for designing an algorithm of early detection of seizure onset based on HRV.

Keywords: Heart rate variability, epileptic seizure, pre-ictal, detection

Soroor Behbahani, Nader Jafarnia Dabanloo, Ali Motie Nasrabadi, Cesar A. Teixeira, Antonio Dourado. Pre-ictal heart rate variability assessment of epileptic seizures by means of linear and non-linear analyses. Anatol J Cardiol. 2013; 13(8): 797-803

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