[Relation between fixed and dynamic coronary obstruction in the pathogenesis of various clinical forms of ischemic heart disease].

Ninety-five coronary patients were studied, including 44 patients with stable angina and 51 with unstable angina. All patients underwent bicycle ergometry and the intravenous ergometrin test. An anginal attack developed in response to bicycle ergometry in 63.5% of patients with stable angina and in 74.4% of patients with progressive coronary insufficiency. The threshold capacity achieved was directly related to the functional class of stable angina, and dependent on the clinical variety of unstable angina. The ergometrin test was positive in 70.4% of patients with stable angina and 82.4% of patients with unstable angina. An ergometrin-induced anginal attack developed where the double product was significantly smaller than that of threshold stress. The differences were the highest in patients with progressive angina and attacks of acute coronary insufficiency.