[Body adaptation to stress exposure enhances cardiac resistance to adrenotoxic damage].

Models of adrenergic arrhythmias were produced on isolated rat heart under the adrenalin concentration in the perfusion solution of 5.10(-5) M. The rhythm disturbances were accompanied by a pronounced depression of contractile function. It was shown that preliminary adaptation of animals to short-term stress exposures reduced the duration of arrhythmias more than sixfold the contractile function, being maintained at a higher level than in control. The adaptation cardioprotective effect was compared with the effects of adaptation and propranolol appeared similar.