Classification of mitochondrial disorders
A clear delimitation of mitochondrial metabolic diseases is difficult, more frequently occurring combinations of symptoms were classified as mitochondrial syndrome (Table 1). The disease patterns are not associated with these syndromes, especially in children. Instead, they occur rather unspecifically as encephalomyopathies, with or without the involvement of other organs.
An in-depth delimitation of mitochondrial disorders or a complete schedule of the syndrome can be found in the guidelines section.
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Table 1: Examples of mitochondrial syndromes
Syndrome | Description |
Leigh | Sub acute necrotizing encephalomyelopathy |
MELAS | Mitochondrial myopathy, encephalopathy, lactic acidosis stroke-like episodes |
MERRF | Myoclonic epilepsy and ragged-red fibres |
CPEO | Chronic progressive external ophthalmoplegia |
Kearns Sayre | CPEO, Herzreizleitungsstörung, retinopathy |
Pearson | Sideroblastic anaemia, exocrine pancreas dysfunction |
NARP | Neuropathy, ataxia, retinitis pigmentosa |
LHON | Leber's hereditary optic neuropathy |
Alpers | Progressive infantile polio dystrophy |
MNGIE | Myoneurogastrointestinal encephalopathy |
Barth | Cardiomyopathy, neutropenia, myopathy |