ABSTRACT
On the basis of a randomized analysis of ECG of 200 patients in the acute phase of myocardial infarction the relative incidence of partial blocks was demonstrated: 33% among the survivors, and 54% among the hospital mortality cases. The prognostic value of the development of blocks was supported by the fact that it corresponded to further aggravation of the clinical course--increased cardiac pains, manifestations of cardiac insufficiency, development of arrhythmias. The bundle of His branch block may mask the infarction changes of ECG. Signs of incomplete blocking were revealed that include a leftward deviation of the axis, increase of R-wave amplitude in the 1 and aVL leads, appearance of enhancement of the S-wave in the II and V5-6 leads that preceed a complete blocking of the appropriate branch. The obtained data indicate the necessity of tracing the intraventricular conduction in the course of ECG monitoring during the acute period of myocardial infarction.
