[ECG T-wave velocity indicators in patients with myocardial infarction].

The ECG is shown to carry important additional information namely the speed with which the difference of the potentials changes in the period of repolarization of the ventricular myocardium which was assessed on the basis of the first derivative of the ECG. The quantitative evaluation of the first derivative of T wave is possible with the help of the following parameters: RMS-ratio of the maximum scalar values of the speed at the terminal and initial segments of T wave; TMA-time over with the maximum acceleration at the initial segment of T wave; RAEV-ratio of the adjacent extreme values at the initial segment of T wave of the first derivative of the ECG; CD -- coefficient of disproportion of the ratio between the maximum and the minimum values of the RMS at various leads in a given individual. The examination of 347 patients showed that the proposed quantitative parameters characterizing T wave of the differential ECG made it possible to differentiate T wave of patients with acute and cicatricial periods of myocardial infarction and angina patients.