Medical-Surgical Endocrine Practice Test

Pheochromocytoma surgery requires blunting the surge of catecholamines that happens when the tumor is manipulated. The main issue is preventing sudden increases in blood pressure, heart rate, and potential arrhythmias during the operation. The best approach is to start alpha-adrenergic blockade before any resection to block the vasoconstrictive effects of catecholamines, which lowers vascular resistance and stabilizes blood pressure. After adequate alpha blockade is achieved, a beta-blocker can be added if there is persistent tachycardia or arrhythmia, but only after alpha blockade to avoid unopposed alpha stimulation that could trigger a dangerous hypertensive crisis. Intraoperative hemodynamic monitoring is essential so the team can promptly manage blood pressure swings, and efforts should be made to avoid triggers that provoke catecholamine release during anesthesia. Volume status also matters, since alpha blockade can cause vasodilation and relative hypovolemia, so careful fluid management is important. This combination—alpha blockade first, cautious use of beta-blockade after adequate alpha blockade, vigilant monitoring, and avoidance of hypertensive triggers—best protects the patient during pheochromocytoma surgery.