[Rhythmographic study of the frequency dependence of extrasystole in ischemic heart disease].

Results are given of the rhythmographic study of the frequency of extrasystole at rest, in the orthostatic position and during exercise in 236 patients with chronic ischaemic disease of the heart. The frequency dependence of extrasystole (the rate dependence of premature beats) was seen in 75.4% of cases. In the absence of the rate dependence of extrasystole, novocainamide, propranolol and atropine exerted marked antiarrhythmic effect less frequently than when such a dependence was present.