Abstract：
INTRODUCTION:Clinical, electrophysiological, genetic and biochemical deficiencies variability were evaluated in 52 patients diagnosed of mitochondrial respiratory chain diseases (MRCD). PATIENTS AND METHODS:26 men and 26 women, aged 19 to 79 years, were tested by clinical examination, electrophysiological techniques, muscle biopsy and genetic and biochemical studies. RESULTS:The patients were classified into seven phenotypes: myopathy, chronic progressive external ophthalmoplegia, progressive ophthalmoplegia plus ataxia, Kearns-Sayre syndrome, mitochondrial encephalomyopathy with lactic acidosis and stroke episodes (MELAS), myoclonic encephalopathy with ragged-red fibers (MERRF), and encephalopathies. Each phenotype may begin by different ways. The electromiography showed myopathy in 39 cases and various types of neuropathy in 10. Ragged-red COX negative fibers or widespread electron microscopic abnormalities were found in 47 cases. Simple deletions, multiple deletions and three different point mutations were observed. Deficiency of complexes I, II, III and IV were found alone or in different associations. CONCLUSIONS:MRCD shows wide variations in clinical, genetic and biochemical studies. Some patients with nonspecific manifestations, mainly of central nervous system, need careful attention and to be on account of diagnostic suspicion.
journal_name
Rev Neuroljournal_title
Revista de neurologiaauthors
Arpa-Gutiérrez FJ,Cruz-Martínez A,Campos-González Y,Gutiérrez-Molina M,Santiago-Pérez S,Pérez-Conde MC,López-Pajares MR,Martín-Casarrubias MA,Rubio-Muñoz JC,del Hoyo P,Arpa-Fernández A,Arenas-Barbero Jsubject
Has Abstractpub_date
2005-10-16 00:00:00pages
449-54issue
8eissn
0210-0010issn
1576-6578pii
rn2005206journal_volume
41pub_type
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