Kardiologiya
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Mechanisms involved in the development of parasystole and extrasystole are substantiated on the basis of vast clinical material (261 patients with parasystole and 45 with extrasystole). The use of functional tests employing exercise and atropine contributed to both the correct diagnosis of parasystole and extrasystole and a logical explanation of the mechanisms governing their development. ⋯ The localization of ectopic foci in parasystole and extrasystole confirms the hypothesis of the mechanisms involved in these arrhythmias. A parallel study of parasystole and extrasystole defined parasystole as active heterotopia, and extrasystole, as passive heterotopia incapable of generating a rhythm.