[Myocardial blood flow and changes in the electrocardiogram during veloergometry in patients with ischemic heart disease]. / Miokardial'nyi krovotok i izmeneniia élektrokardiogrammy vo vremia veloérgometrii u bol'nykh ishemicheskoi bolezn'iu serdtsa.

The authors studied in 64 patients with ischemic heart disease and 14 control persons the myocardial blood flow and its relationship with depolarization and repolarization indices and depression of the ST segment at threshold loads. The myocardial blood flow in IHD patients with stenosing atherosclerosis of two and three coronary arteries was reduced by 50% and the tolerance to physical load was low.

[ECG changes during the exercise test and perfusion pressure in the basin of the left coronary artery]. / Izmeneniia EKG vo vremia veloérgometrii i perfuzionnoe davlenie v basseine levoi koronarnoi arterii.

Variation in cumulative electrocardiographic depolarization (delta epsilon QRS) and repolarization (delta epsilon T and ST depression below 1 mm and more) parameters at threshold stress, achieved by stepwise augmentation, was compared with perfusion pressure in the left coronary arterial network, measured at coronaro-angiography, in 103 coronary patients. It is concluded that changes in cumulative ECG parameters at threshold stress can only be suggestive of a possible drop in perfusion pressure in the left coronary arterial network.