plasma concentrations of dopa , norepinephrine , and the norepinephrine metabolites 3,4-dihydroxyphenylglycol ( dhpg ) and 3-methoxy-4-hydroxyphenylglycol ( mhpg ) were measured in arterial blood and blood draining the heart , brain , and forearm of 21 patients undergoing cardiac catheterization .
C0018787
heart
C0018795
cardiac catheterization