[Results of a long-term follow-up of exercise test indicators in patients with various courses of stenocardia].

The study was undertaken to examine the natural history of stable angina in 295 patients who had been followed up for an average of 5.4 years. The results showed that among them the survival rate was 77%. Out of 217 survivors, 47.5% exhibited no changes in the manifestations of coronary heart disease, only 7.8% showed improvement and increase in exercise performance, in 44.7%, their status became worse as manifested by more frequent anginal attacks and significantly diminished exercise tolerance; 3.2% developed congestive heart failure, there were marked ECG cardiac arrhythmias or scarry changes due to sustained myocardial infarction in 3.2% and 11.1%, respectively.