The results of pyrophosphate 99mTc scintigraphy of the myocardium during exercise were compared with the parameters of the tolerance and adaptation to the load and the frequency of manifestations of myocardial ischemia during bicycle ergometry in relation to the prognostic value with regard to coronary heart disease (CHD) development. The studies involved 21 patients with myocardial infarction at the early recovery period and 23 CHD patients without a history of myocardial infarction. Manifestations of myocardial ischemia and the pattern of pyrophosphate build-up in the myocardium during exercise are approximately equally informative with regard to the prognosis of a high risk of complications in CHD patients. As regards the capacity to detect patients with a low risk of CHD complications, the finding of pyrophosphate 99mTc scintigraphy of the myocardium are more reliable than the electrocardiographic manifestations of myocardial ischemia or chest pain during bicycle ergometry. The parameters of the tolerance and adaptation to the load were found to be of little use in predicting CHD complications.
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