these results led to the following conclusions : dopexamine hydrochloride stimulates the heart by 2 mechanisms -- ( 1 ) baroreceptor-mediated release of norepinephrine resulting from hypotension produced by beta 2 adrenoceptor and da1 dopamine receptor-mediated vasodilatation , and ( 2 ) potentiation of the released norepinephrine due to prevention of norepinephrine uptake by sympathetic nerves .
C0020649
hypotension
C0028351
norepinephrine