Resumen

DE MICHELI, Alfredo  y  MEDRANO, Gustavo A. Usefulness of the vectorial analysis of the electrocardiogram. Arch. Cardiol. Méx. [online]. 2001, vol.71, n.3, pp.237-240. ISSN 1665-1731.

An electrocardiogram corresponding to an obese, hypertensive woman 52 years old, is presented. It shows a left bundle branch block of advanced degree and the ÂQRS_F at 70º. In this case, the key of the electrocardiographic diagnosis is that the second vector originated by depolarization of the lower left septal mass is oriented downward, which is unusual in the presence of left bundle branch block. This fact may be due to a marked clockwise rotation. Therefore, it is possible that right ventricle pathologic conditions be associated to those involving the left ventricle. Cardiopulmonary tests determined the existence of a chronic pulmonary emphysema. Furthermore the study of this case shows the usefulness of vectorcardiographic exploration in clinical practice.

Palabras llave : LBBB; Ventricular depolarization; Resultant vectors; Second septal vector; Clockwise rotation; Chronic pulmonary emphysema.