why phenoxybenzamine is used in pheochromocytoma?
Preoperative Alpha Blockade for Pheochromocytoma. Brief Summary: Pheochromocytoma is a rare, catecholamine (ex. adrenaline) secreting tumor that requires preoperative alpha blockade to minimize intraoperative hemodynamic instability, thereby reducing intra- and postoperative morbidity and mortality.