these data suggest that the extremely high circulating level of conjugated da in pheochromocytoma may , in the presence of high circulating conjugated norepinephrine and possibly high alpha-adrenergic receptor occupancy , decrease blood pressure by its predominant action on dopaminergic receptors while elevated free da may decrease the tendency to tachycardia , possibly by lowering the venous return .
C0031511
pheochromocytoma
C0013030
da