title: Symptomatic hypotension following the clonidine suppression test for pheochromocytoma.
abstract: A 42-year-old man with generalized atherosclerosis underwent surgery of the left carotid artery with eventual placement of a Dacron graft bypassing the left carotid sinus. Subsequently, symptoms suggestive of pheochromocytoma developed, and 24-hour urine catecholamine levels were elevated. Clonidine testing resulted in suppression of plasma norepinephrine levels but was complicated by severe hypotension and a transient ischemic attack. Baroreceptor dysfunction may have been involved. Caution is advised and recommendations are offered for future usage of the clonidine suppression test.
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000175:diagnosis*; D000328:Adult; D003000:Clonidine / Q000009:adverse effects*; D006801:Humans; D007022:Hypotension / Q000139:chemically induced*; D008297:Male; D010673:Pheochromocytoma / Q000175:diagnosis*
chemical_list: D003000:Clonidine