[An assessment of the reserve potentials of the heart by using volume loading with the exclusion of a portion of the left ventricular myocardium from contraction].

The reserve possibilities of the heart in dosed exclusion of part of the contractile myocardium of the left ventricle were determined by the initial functional condition of the "intact" myocardium. Overexertion by volume in exclusion of part of the myocardium from contraction is dangerous due to exhaustion of the myocardial contractility reserve, relative diminution of coronary circulation with the gradual increase of exertion and overloading of the lesser circulation, which are a secondary cause of the reduction of the reserve possibilities of the heart.