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[Technetium-99m-pyrophosphate myocardial scintigraphy in polymyositis--a case report].

A patient with polymyositis who had cardiac involvement underwent myocardial scan with technetium-99m-pyrophosphate. We used Activity Index for evaluating myocardial uptake of technetium-99m-pyrophosphate, which correlated with the degree of serum creatine phosphokinase elevation. Our findings indicate that these examinations may be helpful for identifying patients who have cardiac involvement and evaluating their response to the treatment with corticosteroids or immunosuppressants.