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[Benign myoclonic epilepsy in infancy]
Insights
Benign myoclonic epilepsy in infancy (NMEI) typically presents with myoclonic seizures. While seizures may remit, long-term intellectual deficits persist, challenging the "benign" epilepsy definition.
Area of Science:
- Neurology
- Pediatric Neurology
- Epileptology
Background:
- Benign myoclonic epilepsy in infancy (NMEI) is a rare epileptic syndrome.
- This study investigates the long-term prognosis and characteristics of NMEI.
Observation:
- Five female patients aged 4-16 years with NMEI were observed.
- Onset ranged from 7 months to 2.5 years, with typical myoclonic seizures affecting the neck and upper extremities.
- Associated symptoms included hypotonia, developmental delays, and intellectual disability.
Findings:
- Valproates, alone or with lamotrigine, showed the most pronounced therapeutic effect.
- While clinical and EEG remission was achieved, two patients developed generalized seizures during puberty.
- Intellectual-mnestic deficits were common even after seizure remission.
Implications:
- The term "benign" in NMEI may only refer to seizure course, not the overall prognosis.
- Long-term neurodevelopmental outcomes require careful monitoring and management in NMEI patients.
- Understanding NMEI's long-term impact is crucial for accurate diagnosis and treatment strategies.
Abstract:
Benign myoclonic epilepsy in infancy (NMEI) is one of rare epileptic syndromes. 5 patients (all female sex) aged 4-16 years were observed. NMEI debuted at the age from 7 months till 2.5 years (mean age 1.3 years). Pathology of pregnancy and labor, disorders in both psychomotor development and genetic predisposition were not found. In all the cases the disease began with typical transitory repeated myoclonic paroxysms of different intensity and frequency, without loss of consciousness and with primary involvement of the muscles of the neck and the upper extremities. Most patients had muscular hypotension, mild coordinatory disorders, delayed psycho-speech development, mental retardation, EEG signs of generalized epileptic activity. Valproates, suxilep, clonazepam and lamotrigin (lamiktal) were used for treatment. The most pronounced effect was achieved using either monotherapy with valproates (depakin) or a combination depakin + lamiktal. A stable clinical-encephalographic remission was achieved in all the patients, but during puberty in 2 patients (15 and 16 years old) rare generalized convulsive fits debuted. High frequency of intellectual-mnestic disorders were found even after a complete remission. So benign definition concerns only a course of the fits, but not NMEI prognosis.