[Correlations of ECG ST segment changes and indicators of left ventricular function in patients with unstable...

Thirty patients with unstable angina pectoris underwent atrial stimulation test under continuous ECG monitoring and repeat coronary ventriculography. All this made it possible to compare ST-segment dynamics with altered parameters of left ventricular contractility in induced myocardial ischemia. It was shown that ischemia that appeared as ST-segment depression caused abnormal regional myocardial contractility in the area of impaired coronary blood flow. At the same time, ischemias shown by ST-segment elevation resulted in abnormal diastolic myocardial relaxation in the left ventricle.