results showed a significantly reduced inotropic response to alpha 1-adrenergic stimulation in 2k-1c rhr hearts irrespective of perfusion pressure ( 50 or 80 mm hg [ pp50 or pp80 ] ) ( +427.5 +/- 62.1 vs +1236 +/- 216.4 mm hg x sec-1 at pp50 , p less than .01 and +339 +/- 98.3 vs +1440 +/- 254 mg hg x sec-1 at pp80 , p less than .001 ) even when comparison was made at equivalent myocardial flow rates ( rhr hearts perfused at 80 mm hg vs control hearts perfused at 50 mm hg ) .
C0027061
myocardial
C0018787
hearts