Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector5915210.17816/kazmj59152MiscellaneousThe mechanism of changes in myocardial contractility during extrasystole and paired cardiac stimulationNaslednoeV. N.info@eco-vector.com1506197960333372401202124012021Copyright © 2021, Naslednoe V.N.2021<p>Reasonable therapy of rhythm disturbances is impossible without taking into account the mechanisms of heart rate alteration. In turn, changes in myocardial contractility in arrhythmias should not be considered only within the framework of physiological self-regulation of the heart [9], since this reduces interest in the alleged pathogenetic role of a number of features of the mechanical activity of the heart muscle.</p>Kazan Medical archiveКазанский медицинский архив