The paper compares the data of selective coronary angiography and 24-hour monitoring in 39 patients with refractory angina pectoris. Transient ST-segment changes were revealed in 79 % of the patients, ST-segment depression occurring in 54 %, ST-segment evelation in 46 %, T-wave inversion in 38 %. A combination of ST-T interval changes and occurrence of ventricular premature contraction was found in a third of the examinees. There was no statistically significant correlation between the extent of major coronary lesion and the mean length of ST-segment displacements.