Early myoclonic epileptic encephalopathy (E.M.E.E.)

Area of Science:

• Neurology
• Pediatrics
• Epileptology

Background:

• Infantile epileptic encephalopathies represent a group of severe neurological disorders.
• Early Myoclonic Epileptic Encephalopathy (EMEE) is a distinct clinical entity characterized by specific seizure types and EEG patterns.

Purpose of the Study:

• To describe the electroclinical features and evolution of nine cases of EMEE.
• To propose EMEE as a distinct electroclinical entity within infantile epileptic encephalopathies.

Main Methods:

• Case series analysis of nine infants with EMEE.
• Comprehensive clinical, electrophysiological (EEG), and etiological investigations including neuroradiological, biochemical, and ultrastructural studies.

Main Results:

• EMEE onset between 2 days and 10 weeks of life, with myoclonic jerks, partial seizures, and periodic EEG abnormalities.
• Progressive neurological deterioration leading to decerebrate posture and opisthotonos.
• Etiology remained undetermined despite extensive investigations, though patterns suggested metabolic disorders.

Conclusions:

• EMEE presents a homogeneous electroclinical pattern warranting classification as a distinct entity.
• The uniformly downhill course suggests potential familial recurrence, possibly linked to a metabolic etiology.
• Further research into metabolic causes is warranted for EMEE.