Interrelation between cardiac pump function disturbances and cardiac contractility after beta-adrenergic hyperstimulation of the heart in rats
Kuz'menko MO, Pavliuchenko VB, Tumanovs'ka LV, Dosenko VIe, Moĭbenko OO
Bogomoletz Institute of physiology NAS of Ukraine, Kyiv, Ukraine
DOI: https://doi.org/10.15407/fz57.02.003
Abstract
The complex of structural and functional changes of myocardium was investigated in experiments with rats with chronic P-adrenergic activation for 1 month. We observed substantial attenuation of myocardial pump function, particularly reduction of stroke volume by 38,50% (P<0,01), cardiac output by 42,38% (P<0,01), and ejection fraction by 35,61% (P<0,01). Furthermore, 2-fold increase of end-diastolic left ventricular pressure (P<0,01) and rise of active relaxation constant Tau by 12,91% (P<0,05) were observed. This indicates on an impaired diastolic function of the heart that is associated with accumulation of connective tissue elements in myocardium and increase of its end-diastolic stiffness that finally leads to cardiac pump function disturbances. Surprisingly, myocardial contractility was considerably augmented not only after the treatment with P-adrenergic agonist but also on the 26th day after drug cessation. This phenomenon is associated with elevation of dP/dt by 49,9% (P<0,01), 2,5-fold increase of end-systolic elastance (P<0,01) as well as maximal myocardial elastance by 42,53% (P<0,05). It can be explained by compensatory influence of increased contractility that nevertheless failed to maintain adequate cardiac pump function and furthermore it may result in depletion of cardiac energy resource.
Keywords:
?-адренорецепторы, сократимость,насосная функция, сердце.
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