basal excretion of dopa , dopamine , noradrenaline and adrenalin and its variation in response to oral administration of l-dopa , a catecholamine precursor , were measured in 491 patients with essential hypertension , cardiomyopathy and myocardial infarction to assess catecholamine synthesis reserves at the systemic level .
C0013023
dopa
C0007412
catecholamine