[Comparison of the changes in the QRS complex of the ECG with data from a pathologicoanatomic study in acute myocardial infarct].

A comparison of electrocardiographic and anatomic data was made in 74 patients with acute myocardial infarction with the purpose of investigating QRS-complex changes in macrofocal myocardial infarction, and establishing the correlation between ECG data and the volume of the infarcted myocardium. It has been shown that subendocardial and transmural necrosis of the anterior wall of the left ventricle was in all cases reflected on ECG by QS, while transmural necrosis of the posterior wall was associated in 86% of the cases with the presence of QR, Qr or qR on ECG. Thus, the estimation of myocardial necrosis depth by ECG data is difficult. An increase in myocardial necrosis area is paralleled by an increase in Q wave duration, in Q/R ratio value, and by a decrease in R wave amplitude. There was no significant linear correlation between the volume of necrosis area and the amplitude of Q wave of the number of ECG leads in which signs of myocardial infarction were detected.