Seizure Risk After Acute Symptomatic Seizures in Critically Ill Children

What was studied

This prospective observational study followed 365 critically ill children with acute encephalopathy who underwent clinically indicated continuous EEG monitoring in a pediatric intensive care unit. Children with pre-existing epilepsy were excluded.

Researchers assessed subsequent seizure or epilepsy diagnoses, factors associated with those outcomes, and whether discharge on an antiseizure medication was associated with later diagnosis. They also developed a four-variable Seizure/Epilepsy Risk Score.

What they found

During follow-up, 64% of the children had a subsequent seizure or epilepsy diagnosis. This outcome was strongly associated with clinical seizures or status epilepticus before continuous EEG, electrographic seizures or status epilepticus during EEG monitoring, and antiseizure medication administration during the admission.

The risk score showed generally increasing risks ranging from 13% to 96% and had good ability to distinguish higher from lower risk. After propensity score adjustment, children discharged on antiseizure medication had a similar risk of a subsequent seizure or epilepsy diagnosis to those discharged without medication.

Limits of the evidence

This was an observational study, so it cannot establish that the associated factors caused later seizures or that discharge medication did or did not prevent them. Although propensity score adjustment was used, unmeasured differences between children discharged with and without medication may remain. The findings are based on critically ill children with acute encephalopathy who underwent clinically indicated continuous EEG monitoring and may not apply to other groups. The abstract does not report the follow-up duration, identify all four risk-score variables, or describe validation in a separate population.

For families and caregivers

Subsequent seizures or an epilepsy diagnosis were common in this selected group of critically ill children, particularly when clinical or EEG-detected seizures occurred during the acute illness. The risk score may help clinicians identify children who need closer follow-up, although additional validation would strengthen its usefulness. The discharge-medication finding does not prove that antiseizure medication has no benefit or should be stopped; treatment decisions should be individualized by the care team.

What to watch next

Further studies should validate the risk score in separate groups of children and more directly evaluate discharge antiseizure medication strategies, follow-up duration, and longer-term outcomes.

Terms in this summary

acute symptomatic seizure

A seizure occurring during or soon after an acute illness or brain injury.

acute encephalopathy

A sudden disturbance in brain function that may cause confusion, reduced alertness, or seizures.

continuous EEG

Long-term recording of the brain's electrical activity, often used to detect seizures with few or no visible signs.

status epilepticus

A prolonged seizure or repeated seizures without adequate recovery between them; it is a medical emergency.

antiseizure medication

Medicine used to stop seizures or reduce their occurrence.

observational study

A study in which researchers observe care and outcomes without assigning treatments.

odds ratio

A measure comparing the odds of an outcome between groups with and without a particular factor.

propensity score adjustment

A statistical method used to make treatment groups more comparable when treatment was not randomly assigned.