dopamine-beta-hydroxylase ( dbh ) , the enzyme responsible for the biosynthesis of norepinephrine from dopamine was assayed in the blood serum of 23 normal adults , 16 patients with congestive heart failure , 19 patients with asymptomatic ischemic heart disease , 4 patients with angina pectoris at rest , 15 patients with essential hypertension , 8 patients with essential hypotension , 5 patients with neurocirculatory asthenia , and 9 normal adults before and after the exercise test .
C0013030
dopamine
C0020649
hypotension