The author reports the case of a 67-year old woman with phaeochromocytoma, orthostatic hypotension, muscular exhaustion and weakness. After differential diagnosis with primary myopathy, MEN type IIb and Shy-Drager syndrome, the disease appears to be due to the combined action of the secretion of epinephrine and antihypertensive drugs, accentuated by the administration of alpha-adrenergic blocking drugs in the preoperative period.
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