EEG delay in status epilepticus linked with worse outcomes in observational study

What was studied

Researchers reviewed records from 163 adults treated at one Danish hospital from 2008 to 2017. All had first-time, non-anoxic, non-convulsive status epilepticus confirmed by EEG.

They measured the time from the last antiseizure treatment or clinical suspicion of status epilepticus until EEG confirmation. They examined new neurological deficits at discharge and death from any cause over two years. They also assessed two retrospective German cohorts totaling 906 patients from centers with different weekend EEG availability.

What they found

The median delay to EEG confirmation was 11.7 hours. Longer delays were associated with longer status epilepticus, new neurological deficits at discharge, and higher long-term mortality. The mortality difference was driven mainly by delays longer than 22.6 hours.

The association between delay and higher one-year mortality remained in analyses that adjusted for factors including age and the cause of status epilepticus. Delays were longer for Friday and Saturday admissions when next-day EEG was unavailable, and survival was lower. In the German cohorts, cause-dependent weekend-versus-weekday mortality differences were observed where weekend EEG access was lacking but not in centers with weekend EEG availability.

Limits of the evidence

This was a retrospective observational study, so it identifies associations but cannot establish that EEG delays caused neurological deficits or death. Other differences between patients may have contributed to both longer delays and worse outcomes, although the analyses adjusted for factors including age and cause. The main cohort came from one hospital and included only EEG-confirmed cases, which may limit how broadly the findings apply. The abstract does not provide details about treatment after EEG confirmation or all differences between the participating centers.

For families and caregivers

The findings suggest that timely EEG access, including on weekends, may help hospitals confirm non-convulsive status epilepticus sooner and could be an important system-level target. However, this study does not prove that faster EEG access will improve the outcome of an individual patient or show how much benefit it might provide.

What to watch next

Prospective studies could test whether organized rapid or round-the-clock EEG access reduces diagnostic delays and improves neurological outcomes and survival.

Terms in this summary

EEG

Electroencephalography, a test that records the brain's electrical activity and can detect ongoing seizures.

Non-convulsive status epilepticus

A prolonged or repeated seizure state without prominent convulsions, which can make recognition difficult without EEG.

Non-anoxic

Not caused by a severe lack of oxygen to the brain.

Neurological deficit

A new problem involving brain or nerve function.

Retrospective cohort study

A study that looks back at existing records for a defined group of patients.

Aetiology

The underlying cause of a disease or condition.

All-cause mortality

Death from any cause during the study period.