A -year-old man is diagnosed with a pheochromocytoma following evaluation for episodic headaches, diaphoresis, and severe hypertension. Elevated plasma fractionated metanephrines and an adrenal mass on magnetic resonance imaging (MRI) confirm the diagnosis. The patient is scheduled for surgical resection of the tumor. Arrange the following management steps in the correct mandatory chronological sequence to safely prepare this patient for surgery.
- 1Initiate alpha-adrenergic blockade (e.g., phenoxybenzamine)
- 2Encourage liberal oral sodium and fluid intake
- 3Initiate beta-adrenergic blockade (e.g., propranolol)
- 4Perform surgical resection of the adrenal tumor
Cevap
The correct sequence is: 1) Initiate alpha-adrenergic blockade, 2) Encourage sodium and fluid intake, 3) Initiate beta-adrenergic blockade, and 4) Perform surgical resection.
The safe preoperative preparation for pheochromocytoma requires a strict physiological sequence: alpha-blockade to control blood pressure, followed by volume expansion to counter vasodilation, followed by beta-blockade to control heart rate, culminating safely in surgery.
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Anahtar Kavram
In the preoperative management of a pheochromocytoma, alpha-adrenergic blockade MUST always precede beta-adrenergic blockade to prevent unopposed alpha-receptor stimulation and a life-threatening hypertensive crisis.