Related Experiment Videos
Heart rate variability in patients with epilepsy
T Tomson1, M Ericson, C Ihrman
1Department of Clinical Neuroscience, Karolinska Hospital, Stockholm, Sweden.
Epilepsy Research
|April 29, 1998
Summary
Patients with epilepsy, particularly temporal lobe epilepsy (TLE), show altered autonomic function, indicated by reduced heart rate variability. Anti-epileptic drug therapy, especially carbamazepine (CBZ), may also impact autonomic control.
Area of Science:
- Neurology
- Cardiology
- Autonomic Neuroscience
Background:
- Autonomic dysfunction is increasingly recognized in epilepsy.
- Heart rate variability (HRV) analysis offers a non-invasive method to assess autonomic function.
- Understanding HRV alterations in different epilepsy types and their relation to anti-epileptic drugs (AEDs) is crucial.
Purpose of the Study:
- To investigate autonomic function using HRV spectral analysis in patients with juvenile myoclonic epilepsy (JME) and temporal lobe epilepsy (TLE).
- To evaluate the influence of specific AEDs (carbamazepine, valproate, phenytoin) on HRV.
- To explore potential links between HRV changes, epilepsy type, and AEDs.
Main Methods:
- Ambulatory 24-hour electrocardiogram (EKG) recordings were obtained from 21 JME patients, 21 TLE patients, and age/sex-matched healthy controls.
- HRV was analyzed in both time and frequency domains.
- Comparison of HRV parameters between patient groups and their respective controls, considering AED treatment.
Main Results:
- TLE patients exhibited significantly lower RR-interval standard deviation, low frequency power, and low frequency/high frequency ratio compared to controls.
- A reduced low frequency/high frequency ratio was the sole significant difference observed in JME patients versus controls.
- Carbamazepine (CBZ) treatment was associated with significantly lower HRV parameters, including RR-interval standard deviation and low frequency power, compared to controls.
Conclusions:
- Epilepsy patients demonstrate altered cardiac autonomic control, characterized by reduced HRV measures, potentially indicating decreased sympathetic tone.
- These HRV alterations may be attributable to the underlying epilepsy or the effects of AEDs.
- Further research is necessary to elucidate the clinical significance of these HRV changes, particularly concerning the risk of sudden unexpected death in epilepsy (SUDEP).