the following criteria of the myocardial insufficiency were revealed on myocardial fragments of the human auricule tissue ( auricula atrii ) removed in correction of the valvular cardiac defects : 1 ) fall of the contraction amplitude in the rhythmic row even with the stimulation frequency of 1 -- 3 hz ( normal mycadrium is characterized by increased contraction amplitude -- positive bowdwitch steps ) 2 ) monophasic character of the frequency-force curve ( in a normal myocardium the curve is three-phasic in shape ) ;
C0018787
cardiac
C0027061
myocardium