Canadian Medical Guide > Diseases > Musculoskeletal Diseases > Muscular Diseases > Mitochondrial Myopathies > Mitochondrial Encephalomyopathies > MERRF Syndrome Terms and Definitions

MERRF Syndrome

Medical Definition:	A mitochondrial encephalomyopathy characterized clinically by a mixed seizure disorder, myoclonus, progressive ataxia, spasticity, and a mild myopathy. Dysarthria, optic atrophy, growth retardation, deafness, and dementia may also occur. This condition tends to present in childhood and to be transmitted via maternal lineage. Muscle biopsies reveal ragged-red fibers and respiratory chain enzymatic defects. (From Adams et al., Principles of Neurology, 6th ed, p986)
Guide Notes:	DF: MERRF
Previously Indexed:	Epilepsy, Myoclonic (1980-1992),Mitochondria, Muscle (1980-1992)

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