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[Myoclonic epilepsies in infancy]
1Departamento de Pediatría, Facultad de Medicina, Hospital Universitario, Valladolid, España.
Insights
Myoclonic epilepsies are a diverse group of seizure disorders with varied origins and prognoses. Some forms have favorable outcomes, while others are progressive and refractory.
Area of Science:
- Neurology
- Epileptology
Context:
- Myoclonus presence signifies diverse neurological conditions, including epilepsy syndromes.
- Distinguishing between epileptic and non-epileptic myoclonus is crucial for diagnosis.
- Epileptic encephalopathies with myoclonic seizures range from classic syndromes to progressive forms.
Purpose:
- To review the main types of myoclonic epilepsies.
- To analyze clinical, EEG, and therapeutic aspects of these epilepsies.
- To incorporate recent genetic findings in the understanding of myoclonic epilepsies.
Summary:
- Myoclonic epilepsies encompass a wide spectrum, including benign childhood, juvenile, and progressive forms like Unverricht-Lundborg disease and Lafora disease.
- The review covers clinical presentations, electroencephalogram (EEG) findings, treatment strategies, and genetic underpinnings.
- Other related conditions such as neuronal ceroid lipofuscinosis and mitochondrial cytopathies are also briefly discussed.
Impact:
- Myoclonic epilepsies are highly heterogeneous, presenting diverse origins and prognoses.
- Outcomes range from favorable to progressive and refractory forms with poor prognoses.
- This review aids in understanding the complexity and variability of myoclonic epilepsies.
Introduction:
The presence of myoclonus in a patient has different meanings: there exist myoclonus without encephalopathy or epilepsy (sleep myoclonus), encephalopathies with non-epileptic myoclonus (Kinsbourne's syndrome), encephalopathies with epileptic myoclonus (progressive or not), epileptic encephalopathies with myoclonic seizures (the classic West and Lennox-Gastaut syndromes) and myoclonic epilepsies.
Development:
Main types of myoclonic epilepsies (benign childhood myoclonic epilepsy, severe-polymorphic-myoclonic epilepsy, juvenile myoclonic epilepsy, childhood familial myoclonic epilepsy, benign reflex myoclonic epilepsy, as well as progressive myoclonic epilepsies, among which progressive myoclonic epilepsy (PME) type 1 (Unverricht-Lundborg's disease) and PME2 (Lafora type) are prominent, whereas other entities, such as those related to neuronal ceroid lipofuscinosis or mitochondrial cytopathies are discussed more briefly) are reviewed, analyzing clinical, EEG and therapeutic issues, while the most recent contributions in the field of genetics are considered.
Conclusions:
Myoclonic epilepsies constitute a very heterogeneous type of epilepsy, both in their origin and in their prognosis, with favorable forms of course along with other progressive and refractory forms with an ill-fated prognosis.