however , marked elevations of serum dopamine-beta-hydroxylase ( dbh ) accompanied by relatively slight elevations of plasma catecholamines are observed during hypertensive paroxysms in patients with autonomic hyperreflexia , while marked elevations of plasma catecholamines with little if any change in serum dbh concentration are characteristic of hypertensive paroxysms caused by pheochromocytoma .
C0229671
serum
C0032105
plasma