Neonatal seizures: diagnostic updates based on new definition and classification

Area of Science:

• Neurology
• Neonatal Medicine
• Epileptology

Background:

• Neonatal seizures are common neurological symptoms with diverse causes.
• Diagnosis and treatment are difficult due to unique pathophysiology and electroclinical features in neonates.
• Many seizures are subclinical or present with non-specific signs.

Purpose of the Study:

• To introduce the new definition and classification of neonatal seizures proposed by the International League Against Epilepsy (ILAE) Task Force.
• To highlight the critical role of electroencephalography (EEG) in diagnosing and managing neonatal seizures.
• To provide a framework for understanding seizure types based on clinical and electrographic findings.

Main Methods:

• Review and adoption of the ILAE Task Force's proposed definition and classification system.
• Emphasis on electroencephalography (EEG) for defining and diagnosing neonatal seizures.
• Categorization of seizures based on electrographic activity and clinical manifestations.

Main Results:

• Neonatal seizures are defined as abnormal, paroxysmal electrographic events.
• Classification includes electroclinical seizures (with clinical signs) and electrographic-only seizures (without clinical signs).
• Seizure types are categorized into motor (e.g., clonic, tonic) and nonmotor (e.g., autonomic, behavioral arrest) based on predominant features.

Conclusions:

• The new ILAE classification provides a standardized approach to neonatal seizures.
• EEG is essential for accurate diagnosis, differentiating true seizures from other neonatal events.
• Evaluation of underlying etiologies (hypoxic-ischemic encephalopathy, structural, genetic, metabolic) is crucial for appropriate management of neonatal-onset epilepsy.