Identification of a common brain network associated with lesional epilepsy

TL;DR

This study identifies a brain network linked to epilepsy after stroke, which could help predict risk and guide treatments like deep brain stimulation.

Contribution

The study reveals a common brain network associated with poststroke epilepsy across various lesion types and its relevance to DBS.

Findings

Negative functional connectivity between lesion locations and the basal ganglia and cerebellum increases poststroke epilepsy risk.

Lesion network nodes linked to epilepsy are consistent across different lesion types.

Functional connectivity between DBS sites and lesion network nodes correlates with seizure control after DBS.

Abstract

Stroke is the leading cause of neurological diseases globally. Remarkably, epilepsy is a common complication of stroke, which greatly impairs the quality of life of patients and poses a significant clinical challenge. Therefore, a better understanding of the risk factors for poststroke epilepsy is crucial. A recent study published in JAMA Neurology studied the brain network associated with poststroke epilepsy in a group of 76 patients compared to a cohort of 625 control patients using lesion mapping techniques. The results showed that negative functional connectivity between lesion locations and regions in the basal ganglia and cerebellum confers a higher risk of developing epilepsy after stroke. The lesion network nodes associated with epilepsy were identical across different lesion types including hematomas, traumas, tumors, and tubers. Furthermore, the poststroke epilepsy brain network has potential therapeutic relevance to deep brain stimulation (DBS). In a cohort of 30 patients, the functional connectivity between anterior thalamic DBS sites and the lesion network nodes was found to correlate with seizure control after DBS. In summary, the finding provides a novel method for predicting the risk of poststroke epilepsy in patients and may guide brain stimulation treatments for epilepsy.