[Vectorcardiographic study of an unusual form of hypertrophic cardiomyopathy].

The many aspects of heart electrical activity in hypertrophic cardiomyopathy have recently been described in numerous occasions. A vectorcardiographic study was made of two sisters with an echocardiographic diagnosis of hypertrophy of the free wall of the left ventricle. Both the ECG and the VCG shown evidence of pseudonecrosis and pseudoischaemia associated with left intraventricular conduction disturbances and left atrial dilatation. It is felt that echocardiography, and the two-dimensional examination in particular, is essential in the diagnosis of myocardial hypertrophy, but it is pointed out that ECG, and above all VCG, may sometimes indicate its site and extent with a good degree of approximation.