In thirty patients with subacute thyroiditis the authors examined cardiovascular system with the use of the ECG as the most accessible and informative enough method. The clinical and ECG alterations were compared before and after the treatment with glucocorticoids. It was established that the patients with subacute thyroiditis had clinico-electrocardiographic alterations attesting to the presence of myocardiodystrophy. The alterations seen on the ECG mirrorred fully enough the impairment of the cardiovascular system. Myocardiodystrophies associated with subacute thyroiditis undergo reverse development as the remission of the underlying disease is attained as a result of specific therapy with glucocorticoids. This is confirmed by the electrocardiographic findings in the course of the treatment.
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