Prevalence and progression of mitochondrial diseases: a study of 50 patients

Prevalence and progression of mitochondrial diseases: a study of 50 patients

Arpa J; Cruz-Martinez A; Campos Y; Gutierrez-Molina M; Garcia-Rio F; Perez-Conde C; Martin MA; Rubio JC; Del Hoyo P; Arpa-Fernandez A; Arenas J

Muscle & Nerve

2003

Female; Humans; Male; Adult; Aged; Middle Aged; Disease Progression; Survival Analysis; Phenotype; adolescent; IM; Age of Onset; Electromyography; Chronic Progressive External/ep [Epidemiology]; Chronic Progressive External/ge [Genetics]; Chronic Progressive External/pa [Pathology]; DNA; Epilepsies; Lactic Acid/bl [Blood]; MELAS Syndrome/ep [Epidemiology]; MELAS Syndrome/ge [Genetics]; MELAS Syndrome/pa [Pathology]; Mitochondrial Diseases/ep [Epidemiology]; Mitochondrial Diseases/ge [Genetics]; Mitochondrial Diseases/pa [Pathology]; Mitochondrial/ge [Genetics]; Muscle; Myoclonic/ep [Epidemiology]; Myoclonic/ge [Genetics]; Myoclonic/pa [Pathology]; Neural Conduction/ph [Physiology]; Ophthalmoplegia; Skeletal/pa [Pathology]; Spain/ep [Epidemiology]

We report 50 patients with various clinical phenotypes of mitochondrial disease studied over the past 10 years in a large urban area (Madrid Health Area 5). The clinical phenotypes showed a large variety of abnormalities in molecular biology and biochemistry. The prevalence of mitochondrial diseases was found to be 5.7 per 100,000 in the population over 14 years of age. Clinical and electrophysiological assessment reveal signs of neuropathy in 10 patients. Electromyographic findings consistent with myopathy were obtained in 37 cases. Six patients died of medical complications. Disease phenotype influenced survival to some degree (P < 0.01). Age of onset and gender were not associated with differences in survival. Mitochondrial disease is thus far more common than expected and a common cause of chronic morbidity.

2003

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