to investigate catecholamine residence in plasma , constant intravenous infusions of increasing duration ( 20 , 40 , and 80 min ) of [ 3h ] norepinephrine [ ( 3h ] ne ) , [ 3h ] isoproterenol [ ( 3h ] ip ) ip ) and a reference substance : 131i-labeled hippurate were performed in six normal volunteers .
C0007412
catecholamine
C0028351
norepinephrine