A 27 year old male patient is referred for resection of pheochromocytoma. Which of the following medications should the patient be taking prior to surgery
Phenoxybenzamine is non selective alpha antagonist, which prevents vasoconstriction. If patient receives beta blocker without alpha blockade, he will experience alpha mediated vasoconstriction that would result in very high blood pressure.
Propranolol
Labetalol
Phenoxybenzamine
Hydralazine