A 44-year-old woman presents with episodic headaches, palpitations, and diaphoresis. Vital signs show BP 180/110 mmHg, HR 98 bpm, RR 16, temp 37°C, SpO2 98%. Plasma metanephrines are elevated at 4.2 times normal; CT abdomen reveals a 3-cm right adrenal mass. She denies chest pain. Preoperatively, she receives a nonselective irreversible alpha blocker to prevent catecholamine-induced hypertensive crisis during tumor resection. Which drug was most likely administered?
- A)Dobutamine
- B)Labetalol
- C)PhenoxybenzamineGABARITO
- D)Prazosin
- E)Metoprolol
Explicação
Phenoxybenzamine is a nonselective irreversible alpha blocker used preoperatively for pheochromocytoma. Alpha blockade must be established before any beta blockade to avoid unopposed alpha mediated vasoconstriction. Ver explicação completa e trilha adaptativa →