[Integral indices of the automatically reproduced spatial QRS loop in the diagnosis of different forms of myocardial hypertrophy].

A total of 249 patients with arterial hypertension taking a variety of clinical forms, primary pulmonary hypertension, dilatation cardiomyopathy, congenital heart diseases with secondary pulmonary hypertension were examined and allocated to 3 groups: 125 patients with left-ventricular hypertrophy (LVH) (group 1); 44 patients with right-ventricular hypertrophy (RVH) (group 2), and 80 patients with combined hypertrophy of both ventricles (CH). Eighty-one normal subjects were taken as controls. New parameters of diagnostic significance were identified by automated reproduction of vectorcardiographic spatial QRSxyz loop (the Macfee-Parungao system) and computer analysis of vectorcardiographic parameters, that improve electrocardiographic diagnosis of cardiac hypertrophies, as compared to the conventional criteria, bringing its accuracy to 88.8% for LVH, 100% for RVH, and 45% for CH. Typical features of myocardial hypertrophy at large are increased area enclosed by the spatial loop (SQRS greater than 3.4 mV2) and/or increased mean vector (LQRSxyz greater than 0.76 mV), while Lx greater than 0.6 mV and/or Lz less than -0.4 mV were specific for LVH; Lx less than 0.05 mV was specific for RVH, and the H angle ranging from -70 degrees to -140 degrees or H of -60 degrees to -140 degrees at Lz less than 1.1 mV, or -50 degrees to -140 degrees at Lz less than 1.5 mV were specific for CH.