The First-Time Seizure Emergency Department Electroencephalogram Study

Area of Science:

• Neurology
• Emergency Medicine
• Diagnostic Imaging

Background:

• Seizures represent a significant reason for emergency department (ED) visits, with a notable proportion being first-time occurrences.
• Prompt diagnosis and management of first-time seizures are crucial for patient outcomes.

Purpose of the Study:

• To evaluate the utility of electroencephalograms (EEGs) obtained in the ED for diagnosing epilepsy in patients with first-time seizures.
• To determine if ED EEGs can guide the initiation of anticonvulsant therapy upon discharge.
• To assess the association of clinical seizure features with epileptic EEGs and the interobserver agreement for EEG interpretation.

Main Methods:

• A prospective study enrolled adult patients presenting with first-time seizures or previous seizures without prior EEG.
• Electroencephalograms (EEGs) were performed in the ED and remotely interpreted by epileptologists.
• Patients were excluded if the seizure cause was identified through laboratory studies or neuroimaging.

Main Results:

• Twenty-four percent of patients diagnosed with epilepsy received prompt initiation of antiepileptic drug therapy from the ED.
• Weighted kappa agreement for EEG interpretation was 0.69, indicating good interrater reliability.
• Follow-up confirmed the appropriateness of ED epilepsy diagnoses and initiated treatments.

Conclusions:

• Electroencephalogram (EEG) performance in the emergency department for adults with first-time seizures yields a substantial rate of epilepsy diagnosis.
• ED-based EEGs facilitate immediate initiation of antiepileptic drug treatment, improving timely patient care.
• Further research with larger cohorts is needed to explore associations between clinical seizure characteristics and ED epilepsy diagnoses.