[The Kearns-Sayre syndrome].

The paper describes Kearns-Sayre's syndrome, a rare hereditary neuromuscular disease, in a patient aged 17 years. The clinical picture of the disease had a classical triad: external ophthalmoplegia, pigmentary retinopathy, and cardiac conduction disturbances. This triad was supplemented with other polymorphous symptoms characteristic of the syndrome, such as moderate myopathic syndrome, hemeralopia, physical infantilism, hypogonadism, pyramidal syndrome. Bifascicular block in the His-Purkinje system was accompanied by mitral prolapse. The problems of early diagnosis of the syndrome and choice of adequate therapeutical methods are discussed.