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Using electrocardiographic technique, the effect of a single hyperbaric oxygenation session (O2 pressure 1.5 atm, duration 40 min) in combination with antianginal drugs (nifedipine--20 mg, propranolol--40 mg, nitrong--6.5 mg, orally) on central hemodynamics and myocardial contractility has been studied in 35 patients with ischemic heart disease and angina pectoris of effort, NYHA functional class II-III. It has been shown that hyperbaric oxygenation reduced the degree of indirect hemodynamic effect of nifedipine, potentiated negative chronotropic and inotropic effects of propranolol and had no impact on the degree of hemodynamic effect of depot-glycerol trinitrate.

Bicycle ergometry and the dipyridamol test were performed in 25 females with coronary artery stenosis and 42 with unchanged coronary arteries (according to the coronarography data). The sensitivity of the dipyridamol test was 80% at its specificity was 78% according to the electrocardiographic data that correlated well with those of bicycle ergometry. The dipyridamol test can be used for examining females with suspected coronary heart disease.

Comparisons were made between the clinical picture, results of bicycle ergometry and selective coronaroangiography, and the data of transesophageal electrical stimulation of the left atrium in 52 patients, including 31 with stenosing coronary atherosclerosis. The feasibility of applying the transesophageal stimulation for the diagnosis of coronary heart disease is shown. The sensitivity of transesophageal electrical stimulation of the left atrium in detecting stenosing coronary atherosclerosis was 81%, its specificity being 79%.

A total of 60 patients with coronary heart disease were examined and divided into 2 groups: (I)53 patients with classical angina pectoris at rest and of effort; (II)7 patients with variant angina pectoris. The results of 24-hour ECG monitoring, bicycle exercise test and coronary angiography were studied. By giving an objective ECG pattern during myocardial ischemia attack. 24-hour ECG monitoring enabled one to differentiate various clinical forms of angina pectoris, establish their connection with heart rhythm disturbances, thus forming the basis for the differential approach to the treatment.