Abruptly attenuated terminal ictal pattern in pediatrics.

Area of Science:

• Pediatric Neurology
• Epileptology
• Clinical Neurophysiology

Background:

• Understanding seizure termination patterns is crucial for diagnosing and managing epilepsy.
• The specific characteristics and implications of abruptly attenuated termination (AAT) in pediatric seizures require further investigation.

Purpose of the Study:

• To examine and categorize ictal discharge patterns at the end of pediatric seizures.
• To specifically analyze the abruptly attenuated termination (AAT) pattern and its associations.

Main Methods:

• Video-electroencephalography (EEG) monitoring data from 200 pediatric seizures over 26 months were analyzed.
• Ictal segments were evaluated for various termination patterns, with a focus on defining and identifying AAT.
• Associations between AAT and other ictal EEG and clinical features were studied.

Main Results:

• AAT was observed in 16% of pediatric seizures, always preceded by repetitive spikes or spike-waves.
• AAT correlated with ictal spread, initial pattern, onset laterality, seizure duration, age, and epilepsy etiology.
• AAT was more frequent in children over 6 months old and those with idiopathic or cryptogenic epilepsy.

Conclusions:

• A minority of pediatric seizures exhibit diffuse, synchronized abrupt attenuation.
• AAT is likely an active, developmentally regulated process.
• The pattern suggests a requirement for mature neurophysiology, potentially involving the thalamocortical circuit.