Repeat Brain Monitoring Can Help Guide Epilepsy Surgery

What was studied

This study looked at children with tuberous sclerosis complex (TSC) who had drug-resistant epilepsy and underwent epilepsy surgery at one hospital. The researchers reviewed past records from 2013 to 2026 to compare children who had one stereo-EEG (sEEG) before surgery with those who had repeat sEEGs.

Out of 45 children with TSC who had epilepsy surgery, 34 had sEEG before surgery. Of those 34, 19 had one sEEG and 15 had two or more sEEGs. The study collected information on seizure testing, surgery type, and seizure outcomes after definitive epilepsy surgery.

What they found

Children whose early video-EEG suggested one seizure focus were more likely to have only one sEEG. Presurgical multifocal findings on video-EEG or MEG were associated with needing multiple sEEGs.

Good seizure outcomes were observed in both groups after surgery. Among patients with at least 1 year of follow-up after their most recent surgery, favorable outcomes (Engel I or II) were seen in 86% of the one-sEEG group and 64% of the repeat-sEEG group at 1 year, and 93% versus 79% at the most recent follow-up. The study reports that these differences were not statistically significant, so it cannot show a clear outcome advantage for either group.

Children with one sEEG more often had laser ablation, while children with multiple sEEGs more often had resective surgery. Some patients in the single-sEEG group also had additional treatment surgeries without repeat sEEG.

Limits of the evidence

This was a retrospective study from a single center, so it can only show patterns in this group and cannot prove that having repeat sEEG led to better or worse outcomes. The number of patients was small, especially for outcome comparisons, and only 24 patients had at least 1 year of follow-up after their most recent surgery. Some reported differences were not statistically significant. Because the study only included children who went on to surgery, the results may not apply to all children with TSC and epilepsy.

For families and caregivers

For families, this study suggests that needing more than one sEEG does not necessarily mean surgery cannot help. Children with TSC often have seizures coming from more than one brain area, which can make planning treatment harder and may require repeat testing or additional surgeries. Even in these more complex cases, many children in this study had favorable seizure outcomes after treatment.

It also suggests that early test results showing multiple seizure areas may signal a more complicated path to surgery. That may help families know what questions to ask and what to expect, but this study does not prove which testing or surgery plan is best for any one child.

What to watch next

Larger, multi-center studies with longer follow-up could help clarify how often repeat sEEG is needed and how outcomes compare in similar children.

Terms in this summary

tuberous sclerosis complex (TSC)

A genetic condition that can cause growths in different organs, including the brain, and often leads to seizures.

drug-resistant epilepsy (DRE)

Epilepsy that does not come under good control after trying standard seizure medicines.

stereo-EEG (sEEG)

A test that places thin electrodes into the brain to find where seizures start.

video-EEG (vEEG)

A test that records brain waves and video at the same time to study seizures.

MEG

A brain scan called magnetoencephalography that helps show where seizure activity may be coming from.

laser ablation

A procedure that uses heat from a laser to destroy a small area of brain tissue causing seizures.

resective surgery

Surgery that removes the part of the brain thought to be causing seizures.

Engel score

A common way to rate seizure outcome after epilepsy surgery, with lower classes meaning better seizure control.