in this preparation droperidol and phentolamine were equieffective. -- droperidol did not produce a significant shift of the noradrenaline concentration-response curves obtained for the positive chronotropic and inotropic effects in spontaneously beating right guinea-pig atria and in electrically driven left atria , respectively. -- it is concluded that droperidol is a competitive inhibitor of the vascular alpha-adrenoceptors , leaving the beta-adrenoceptors of the heart unaffected , and that it inhibits the neuronal uptake mechanism of noradrenaline .
C0225860
left atria
C0018787
heart