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EEG and ECG in sudden unexplained death in epilepsy
Maromi Nei1, Reginald T Ho, Bassel W Abou-Khalil
1Jefferson Comprehensive Epilepsy Center, Department of Neurology, Jefferson Medical College, Philadelphia, Pennsylvania, USA. maromi.nei@jefferson.edu
Epilepsia
|March 20, 2004
Summary
Sudden unexpected death in epilepsy (SUDEP) is linked to higher heart rates during seizures, especially those occurring during sleep. This suggests increased autonomic nervous system activity in SUDEP patients.
Area of Science:
- Epilepsy research
- Cardiology
- Neuroscience
Background:
- Sudden unexpected death in epilepsy (SUDEP) is a significant cause of mortality in epilepsy patients.
- Cardiac involvement is suspected in SUDEP, necessitating further investigation into heart function during seizures.
Purpose of the Study:
- To evaluate cardiac factors, specifically heart rate (HR) and electrocardiogram (ECG) abnormalities, in patients experiencing SUDEP.
- To compare cardiac responses during seizures between SUDEP patients and a control group with refractory partial epilepsy.
Main Methods:
- Collected and analyzed EEG and ECG data from 21 SUDEP patients (definite or probable) and 43 epilepsy patients.
- Correlated ECG abnormalities and HR changes with clinical data, including seizure occurrence during sleep or wakefulness.
Main Results:
- SUDEP patients exhibited significantly higher ictal maximal heart rates (mean 149 BPM) compared to controls (mean 126 BPM).
- Increased HR during seizures was more pronounced in SUDEP patients during sleep (78 BPM increase) versus wakefulness (47 BPM).
- Cardiac repolarization and rhythm abnormalities were observed in 56% of SUDEP patients, versus 39% in controls, though not statistically significant.
Conclusions:
- This study provides novel evidence of heightened autonomic stimulation, indicated by elevated HR, during seizures in SUDEP patients, particularly during sleep.
- Findings suggest a potential role for autonomic dysregulation in the pathophysiology of SUDEP.