[Evaluation of the ST segment and QRS complex in acute myocardial infarction based on the 36 and 6 precardiac ECG leads].

The results are presented of comparison of electrocardiographic data obtained in 36 precordial and 6 standard precordial leads of ECG, and their correlation degree in 20 patients with acute transmural myocardial infarction (MI). Total R-wave and QS complex amplitude, the number of leads recording the mentioned changes (nR and nQS), total ST-segment elevation (epsilon ST) and the number of leads with ST elevation greater than or equal to 1 mm were assessed. The study demonstrated that R-wave and QS complex amplitude, and also the number of informative leads recording these changes were the most reliable markers of ischemia and necrosis. High authenticity of data in 6 leads-standard ECG and accurate correlation of examined indices with similar ones in 36 precordial leads throughout the observation at various points of the testing suggest that the treatment of QRS complex in 6 lead-standard ECG gives a reliable assessment of the prevalence and time course of ischemic myocardial damage in patients with anterior transmural myocardial infarction.