[Comparative studies with 4 orthogonal electrocardiographic systems of left ventricular hypertrophy patients].

One hundred and thirty eight patients with left ventricular hypertrophy confirmed clinically or roentgenologically are discussed, being grouped into three age subgroups, separately males and females. Arterial hypertension is the predominating disease--128. The following orthogonal ECG systems were used: Frank, MacFee, SVEK III and Akulinicev. The results obtained from 155 healthy subjects serve as a comparison. Most typical were established to be the changes with the increased R amplitude in the axes and X, the deviations of Rz being more characteristic for the systems Frank, MacFee and SVEK and in Rx--for Akulinicev system. The changes in some other indices were also discussed (Xt, Xst)--according to age and sex. It was established that the characteristics of left ventricular hypertrophy are electrocardiographically best manifested in MacFee and SVEK, those systems providing positive discrepancies between both sexes.