Alpha blockade in preoperative preparation of patients with pheochromocytomas.

Preoperative preparation in pheochromocytoma is usually performed by alpha-adrenergic blockers. We retrospectively reviewed the efficiency of phenoxybenzamine, prazosin, and doxazosin in preoperative preparation. Phenoxybenzamine was used for preoperative preparation of 21 pheochromocytoma patients, prazosin was used in 11 patients, and doxazosin was used in 17 patients. Intraoperative and early postoperative blood pressure records and postoperative volume replacement records were reviewed. Intraoperative hypertension occurred in 17 patients in the phenoxybenzamine group (81%), eight patients in the prazosin group (73%), and 14 patients in the doxazosin group (82%). There was no statistical difference among the groups (P > 0.05). There was also no significant difference between postoperative blood pressure measurements and the operative and postoperative volume replacements. We have found that there were no significant difference in the operative and postoperative blood pressure and plasma volume control among the three groups. We conclude that pheochromocytoma surgery is safe with any of these preoperative medications.