A typical case of myoclonic epilepsy with ragged red fibers (MERRF) and the lessons learned
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Published on: September 20, 2024
S R Chandra1, T G Issac, N Gayathri
1Department of Neurology, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India.
Abstract:
Mitochondrial diseases have a special predilection to involve the brain in view of its high metabolic demand and the tendency for the formation of excitatory neurotransmitters when there is deficiency of intracellular ATP. These diseases have a great phenotypic variation and need a high degree of suspicion. However, some specific syndromes are well defined, both genotypically and phenotypically. Some of the drugs are potentially fatal mitochondrial poisons and an insight into that may be lifesaving as well as prevent serious morbidities.We report a typical case of myoclonic epilepsy with ragged red fibers (MERRF) with classical phenotype and genotype. There was rapid multiaxial deterioration with the introduction of sodium valproate which partly reversed on introducing mitochondrial cocktail and withdrawal of the offending drug.Sodium valproate, phenobarbitone, chloramphenicol and many anti-viral agents are mitochondrial poisons that increase the morbidity and mortality in patients with mitochondrial disease. More harm to the patient can be avoided with insight into this information.
Insights
Mitochondrial diseases like myoclonic epilepsy with ragged red fibers (MERRF) can rapidly worsen with certain drugs. Prompt recognition and avoidance of mitochondrial poisons like sodium valproate are crucial for patient survival and well-being.
Area of Science:
- Neurology
- Genetics
- Biochemistry
Background:
- Mitochondrial diseases affect the brain due to high energy demands and ATP deficiency.
- These conditions exhibit significant phenotypic variability, requiring a high index of suspicion.
- Some drugs are known mitochondrial poisons, posing life-threatening risks.
Observation:
- A case of myoclonic epilepsy with ragged red fibers (MERRF) presented with typical genotype and phenotype.
- The patient experienced rapid deterioration after sodium valproate administration.
- Partial reversal of symptoms occurred upon drug withdrawal and initiation of a mitochondrial cocktail.
Findings:
- Sodium valproate, phenobarbitone, chloramphenicol, and certain antiviral agents can act as mitochondrial poisons.
- These drugs can exacerbate morbidity and mortality in patients with mitochondrial disorders.
- Awareness of these drug toxicities is vital for preventing severe patient harm.
Implications:
- Early identification of mitochondrial diseases and their specific drug toxicities is critical.
- Avoiding specific medications can prevent severe complications and improve patient outcomes.
- This knowledge is essential for clinicians managing patients with mitochondrial disorders.
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