Wearable Seizure Monitoring: What Devices Can and Cannot Measure

What was studied

This narrative review examined wearable technologies for measuring how often seizures occur. It brought together recent clinical evidence and expert views rather than enrolling a new group of participants.

The review covered movement sensors, features derived from heart electrical signals such as heart rate variability, devices combining several signals, and emerging systems that record brain electrical activity over very long periods, including sensors placed under the skin. It also considered uses in treatment monitoring, remote epilepsy care, and clinical trials.

What they found

Wearable seizure detection has made substantial progress over the past decade, especially for generalized convulsive seizures. For these seizures, high sensitivity can be achieved, meaning a high proportion of seizures are detected. Detection of nonconvulsive seizures remains more limited. Performance varies by seizure type, patient group, individual body responses, and whether testing happens in controlled or everyday settings. Different sensor approaches have advantages and limitations depending on seizure type and clinical context. Turning seizure detection into reliable seizure counts remains a challenge. User trust, consistent device use, and data quality also affect how useful these systems are in care.

Limits of the evidence

The abstract gives no participant counts, numerical accuracy estimates, false-alarm rates, or device-by-device comparisons. It does not describe how studies were selected for this narrative review. The findings do not establish that every wearable can reliably count seizures in everyday life or that wearable monitoring improves treatment outcomes. A possible future role in assessing the risk of sudden unexpected death in epilepsy is discussed, but no evidence that these devices predict or prevent such deaths is reported.

For families and caregivers

Wearables could provide a more objective record of some seizures and help address gaps in seizure diaries. Their usefulness depends on the person's seizure type, the device, and consistent use. A device that detects convulsive seizures well may still have limited ability to detect nonconvulsive seizures.

What to watch next

Stronger evidence would come from real-world studies showing how accurately devices count seizures across different seizure types and patient groups, and whether those counts improve care.

Terms in this summary

Narrative review

An article that discusses existing research and expert views rather than reporting a new study of participants.

Seizure quantification

Measuring how often seizures occur, rather than only detecting individual events.

Generalized convulsive seizure

A seizure involving both sides of the brain that causes stiffening and shaking.

Nonconvulsive seizure

A seizure without the obvious stiffening and shaking of a convulsive seizure.

Sensitivity

The proportion of actual seizures that a device correctly detects.

Heart rate variability

Changes in the amount of time between heartbeats.

Electroencephalography (EEG)

Recording the brain's electrical activity.

Subcutaneous

Placed under the skin.