Heart rate variability during sleep in children with partial epilepsy

Area of Science:

• Neuroscience
• Cardiology
• Pediatrics

Background:

• Autonomic control of cardiac activity is altered in epileptic patients, potentially contributing to sudden unexplained death in epilepsy (SUDEP).
• Previous studies noted ictal and interictal heart rate regulation changes, but specific heart rate variability (HRV) during sleep, unrelated to seizures, remains understudied in children.

Purpose of the Study:

• To evaluate cardiac autonomic function during sleep in children with partial epilepsy, focusing on HRV changes independent of ictal epileptiform activity.

Main Methods:

• Assessed HRV using time- and frequency-domain measures from electrocardiography (ECG) recordings during sleep in 11 children with partial epilepsy and 11 controls.
• Analyzed 5-minute ECG epochs across different sleep stages, excluding periods with epileptiform electroencephalogram (EEG) activity.

Main Results:

• Epileptic subjects exhibited lower overall HRV during sleep, especially during rapid eye movement (REM) sleep and sleep stage 2.
• A significant decrease in high-frequency (HF) band power was observed in epileptic patients.
• The low-frequency (LF) to HF ratio was significantly higher in epileptic children during stages 3/4 and REM sleep compared to controls.

Conclusions:

• Children with partial epilepsy demonstrate basal modifications in autonomic cardiac function during sleep, predominantly during REM sleep.
• These sleep-related autonomic changes may be a significant factor in the pathophysiology of SUDEP, which often occurs during sleep.
• Further investigation of HRV during sleep is crucial for understanding SUDEP risk in individuals with epilepsy.