Review Finds Possible Early Warning Signs Before Seizures

What was studied

This paper was a systematic review, which means the authors searched for and combined results from earlier studies rather than testing a new device themselves. They looked for studies on non-invasive physiologic and environmental biomarkers that might be used to forecast seizures in pediatric patients with epilepsy.

The review searched four medical databases and included 11 observational cohort studies. The studies examined signals that could be measured without invasive procedures or implanted devices. The most common biomarkers studied were cardiovascular measures from an electrocardiogram (ECG).

What they found

Across the 11 studies, cardiovascular biomarkers measured by ECG were the most commonly studied possible markers before seizures. In studies that used anticipation algorithms, the reported pre-ictal times ranged from about 21.8 seconds to 32 minutes. In correlational studies, cardiovascular biomarker changes were observed from about 3.59 seconds to 40 minutes before seizures.

Overall, the review provides an overview of current evidence for seizure forecasting in pediatric epilepsy. However, the evidence was not strong: 9 of the 11 studies were rated low or very low certainty.

Limits of the evidence

This review cannot show that any non-invasive biomarker can reliably forecast seizures in children in real-world use. It summarizes observational studies, and the included studies had methodological flaws, risk of bias, inconsistent results, and indirect or sparse evidence.

Most of the evidence was judged low quality. The abstract does not report the total number of pediatric patients included, specific ages or epilepsy types, or detailed accuracy results for the forecasting methods across studies.

For families and caregivers

Families may be interested because devices have been successful at identifying seizures once they start, but the abstract states that there are no devices or systems on the market that predict seizures. This review shows that researchers are studying possible early biomarkers, especially cardiovascular signals.

For now, this remains an early research area. The findings suggest possible directions for future work, but they are not enough to support dependable seizure prediction for children at this time.

What to watch next

Next steps mentioned in the review include larger sample size studies, further testing of cardiovascular biomarkers together with other physiologic and environmental factors, and approaches that tailor algorithms and biomarker measurements to individual patients.

Terms in this summary

systematic review

A study that collects and summarizes results from many earlier studies using a planned search method.

non-invasive

Not requiring surgery or implanted devices.

biomarker

A body signal or measurement that may give information about a disease or event, such as a seizure.

seizure forecasting

Trying to predict that a seizure may happen before it starts.

electrocardiogram (ECG)

A test that records the heart's electrical activity.

pre-ictal

The period shortly before a seizure starts.

observational cohort study

A study that follows people and records what happens without assigning a treatment.

GRADE

A system used to judge how strong or certain the medical evidence is.