[Intraventricular conduction delays, ventricular pre-excitation and ventricular repolarization anomalies of familial character (author's transl)].

An examination is made on different members of a family in which, owing to hereditary transmission of dominant autosomal type, exist alterations that sometimes manifest with disorders of the intraventricular conduction, sometimes with more or less pronounced aspects of ventricular pre-excitation and some other time with anomalies of the ventricular repolarization phase. In examining the genealogical tree of the family, there are in the fourth generation five cases of short PQ-normal QRS syndrome and one case with ventricular repolarization anomalies; in the third generation six cases with left anterior hemiblock, one case with short PQ-normal QRS syndrome, one case with Wolff-Parkinson-White syndrome and three cases with ventricular repolarization anomalies; in the second generation three cases with bundle branch block associated with left anterior hemiblock. The clinical laboratory investigation permitted to exclude the presence of congenital or acquired heart diseases which, rather frequently are responsible for documented electrocardiographic anomalies; the morphology and cardiac volumetry, put in evidence by radiological examinations, remained within the limits of the normal.