PROGNOSTICATION OF ASYMPTOMATIC MYOCARDIAL-ISCHEMIA IN PATIENTS WITH STABLE ANGINA BASED ON RESULTS OF EXERCISE TEST

The relation of frequency of episodes of painless ischemia on 24-hour ECG to the time between registration of ST-seqment depression and emer gence of angina during bicycle exercise test was studied in 45 men wit h stable class II - III effort angina. In most of the patients with ea rly (relative to registration of 1 mm ST-segment depression) appearanc e of angina during exercise test number of episodes of painless insche mia did not exceed 25% of total number of episodes of ST-segment depre ssion. Meanwhile in about half af;he patients in whom time gap between registration of 1 mm ST-segment depression and onset on angina was eq ual to or exceeded 60 sec more than 75% of ischemic episodes were pain less. Thus time interval between the onset of attack of angina and app earance of 1 mm ST-segment depression during bicycle exercise test is a parameter which allows to identify a group of patients with predomin antly painless ischemic heart disease and a group of patients with low threshold of ischemic pain perception.