[Morphological aspects and electrophysiological evaluation of the vectorcardiogram in inferior myocardial infarction (author's transl)].

The purpose of the paper is to evaluate the vectorcardiographic characteristics of the QRS in inferior myocardial infarction, now extended and modified in the light of recent advances in electrophysiology. The VCGs (Frank system) of 70 patients with old inferior myocardial infarction were analyzed. The most important parameters previously considered by others and the behaviour of the different vectorial groups were considered. The results of the analysis of these parameters were concordant with those obtained by others. The morphologic evaluation of the QRS on different planes allowed our cases to be divided into five vectorcardiographic groups. The evaluation of the morphological aspects of the QRS for a more sure diagnosis of myocardial infarction, specially considering false positive cases, was considered from the semeiological point of view. Moreover, it was shown that some alterations of VCG cannot be apparent electrocardiographically. The electrogenetic meaning of vectorcardiographic alterations, probably related with depth and width of necrosis and with conduction disturbances in the subdivisions of left bundle branch, were evaluated.