[Preclinical ECG changes and their evaluation based on the criterion of symmetrical approach].

To reveal preclinical cardiac performance changes, conventional and unique ECG processing procedures were used in 101 individuals. A classification of heart function was developed, which was based on a comprehensive assessment of ECG. The results of the clinicofunctional classification were well comparable with those of a quantitative ECG analysis made with heuristical methods.

[Changes in electric stability and ultrastructure of the myocardium in heart rate-decreasing paired stimulation].

Experimental rabbits were subjected to a ventricular rate-decreasing paired pacing over an hour. Ventricular rates showed a 1.4-1.