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[Characteristics of status epilepticus in MELAS. Analysis of four cases]
R Ribacoba1, J Salas-Puig, C González
1Unidad de Neurología, Hospital Alvarez-Buylla. rribacobam@meditex.es
Introduction:
Clinical characteristics of status epilepticus (SE) as a first manifestation in patients with MELAS who had not previously epileptic episode has been studied little in the literature.
Objectives:
Our aim was to analyse precipitating factors, clinical characteristics, EEG and difficulties in the treatment of SE in MELAS.
Patients And Methods:
We studied four cases with ages between 27 an 41 years who began with SE and they had been diagnosed with MELAS during the episode. Case 3 was confirmed by autopsy. Cases 1, 2 and 4 showed a 3243 mtDNA mutation in the lymphocytes. Epileptic seizures had not been present in any previous status case. The precipitating factor in cases 1 and 3 was fever and in case 2 and 4 stress by headache. Moreover in case 2 second status was caused by stress in hyperglycaemic ketoacidosis. All cases were studied with EEG and a brain CT or MRI.
Results:
All patients started with epilepsia partialis continua that began with partial motor simple seizures, but sometimes progressed to partial complex seizures or secondary tonic clonic seizures. In two cases the initial symptom was migraine with aura, in two cases fever with cephalalgia and in one case diabetes mellitus decompensation. The EEG during a seizure presented a complex pseudoperiodic complex in the temporal-occipital contralateral region that spread to all hemisphere when myoclonus was increased.
Conclusions:
SE in MELAS appears in cell stress situation precipitated by hypermetabolic conditions and it provokes claudication in ill mitochondria. In fact, events such as fever, glycemic alterations, hypoxemia or headache that could change the normal mechanism of sequester mitochondrial calcium in the neuron are able to trigger SE. Optimal evolution depends on an improvement of basal metabolic conditions that could precipitate the status. Supplementary folic acid, riboflavin and coenzyme Q 10 can be useful.
Insights
Status epilepticus (SE) in MELAS, a mitochondrial disease, is often triggered by cell stress like fever or headache. Managing metabolic conditions and mitochondrial support can improve outcomes.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Epileptology
Background:
- Status epilepticus (SE) as an initial symptom in MELAS (Mitochondrial Encephalopathy, Lactic Acidosis, and Stroke-like episodes) is understudied.
- Understanding SE triggers and characteristics in MELAS is crucial for early diagnosis and management.
Observation:
- Four MELAS patients presented with SE as their first epileptic episode.
- Triggers included fever, stress (headache), and diabetic ketoacidosis.
- Clinical presentation involved epilepsia partialis continua, progressing to more severe seizure types.
Findings:
- EEG showed pseudoperiodic complexes, spreading with seizure severity.
- Mitochondrial DNA (mtDNA) 3243 mutation was identified in three patients.
- SE in MELAS is linked to cellular stress and impaired mitochondrial function.
Implications:
- SE in MELAS is precipitated by hypermetabolic states affecting mitochondrial calcium regulation.
- Improving metabolic conditions and mitochondrial support (folic acid, riboflavin, CoQ10) may optimize outcomes.
- Early recognition of SE triggers in MELAS is vital for patient management.
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