Heart Test Changes May Signal Higher Death Risk In Epilepsy

What was studied

Researchers followed 442 people with epilepsy living in a rural, resource-poor area of China. At the start of the study, each person had a standard 12-lead electrocardiogram (ECG), which records the heart's electrical activity. The ECGs were reviewed for different kinds of abnormalities.

The researchers then tracked deaths over an average of 5.9 years. They looked at long-term mortality, including sudden unexpected death in epilepsy (SUDEP), to see whether certain ECG findings were associated with higher risk.

What they found

About half of the participants had at least one ECG abnormality at the start. The most common were T-wave abnormalities, arrhythmias, and ST-segment depression. T-wave abnormalities were more common in older participants.

During follow-up, 30 people died, including 12 SUDEP cases. Certain ECG findings were associated with higher risk: ventricular conduction defects were associated with a higher risk of SUDEP, and high-amplitude R waves were associated with a higher risk of death not related to epilepsy. The authors suggest ECG may help identify people with epilepsy who are at higher risk of premature death, especially in low-resource settings.

Limits of the evidence

This was an exploratory observational study from a rural cohort in China, so the results may not apply to all people with epilepsy. The number of deaths was small, especially for SUDEP, which makes the risk estimates less certain. Because this was an observational study, it cannot show that the ECG changes caused the deaths. The abstract also does not report whether treatment, seizure control, other health conditions, or repeat ECGs affected the results.

For families and caregivers

This study suggests that ECG abnormalities are common in people with epilepsy and that some ECG findings were associated with higher risk in this cohort. For families, this may matter because an ECG is a simple test that could add useful information in some settings.

Still, these findings do not mean that an abnormal ECG predicts what will happen to one person. These results need confirmation in larger studies. Families may want to ask a clinician whether heart evaluation is needed as part of epilepsy care, especially if there are symptoms like fainting, palpitations, or known heart disease.

What to watch next

Stronger evidence would come from larger studies in different populations with more deaths, including more SUDEP cases, and with careful tracking of seizure control, medicines, and heart conditions.

Terms in this summary

electrocardiogram (ECG)

A test that records the heart's electrical activity.

SUDEP

Sudden unexpected death in epilepsy, when a person with epilepsy dies suddenly and no other clear cause is found.

arrhythmia

An abnormal heart rhythm.

T-wave abnormality

A change in part of the ECG tracing that can reflect changes in how the heart recovers after each beat.

ST-segment depression

A change in part of the ECG tracing seen on an ECG.

ventricular conduction defect

A delay or problem in how electrical signals travel through the lower chambers of the heart.

high-amplitude R waves

Taller-than-usual peaks on part of the ECG tracing.

hazard ratio

A measure used in studies to compare how often an outcome happens in one group versus another over time.