Abstract
Clinical, electrophysiological, histological and biochemical studies of two patients with mitochondrial disease revealed a moderately advanced axonal neuropathy with mitochondrial paracrystalline inclusions in Schwann cells, fibroblasts and muscle fibers. In addition there was a myopathy, and the activity of muscle cytochrome c oxidase was diminished by more than 50%. There were electrophysiological signs of myopathy, neuropathy and failure of excitation-contraction coupling in both patients. The partial enzyme deficiency raises some questions as to its pathogenetic role in these neuromyopathies.
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