Pheochromocytoma: When Preoperative α-Adrenergic Blockade Does Not Achieve Target Blood Pressure and Heart Rate
In hormonally functional pheochromocytoma and paraganglioma (PPGL), achieving defined haemodynamic targets before surgery is essential. When first-line preoperative α-adrenergic blockade — combined with β-blockade for tachycardia and volume loading — does not bring the patient within those targets, a structured intensification protocol applies.
Previous treatment line — goal not reached
Initial blockade with α-adrenergic receptor blockers (phenoxybenzamine or doxazosin) and, where indicated, β-adrenergic receptor blockers for tachycardia, supported by high-sodium diet and intravenous fluid loading, did not achieve the required preoperative blood pressure and heart rate targets.
Clinical targets
Blood pressure below 130/80 mmHg seated and above 90 mmHg systolic when standing; heart rate 60–70 bpm seated and 70–80 bpm standing.
Next-step approach — partial overview
When α-blockade alone is insufficient, add-on therapy with a calcium channel blocker is the most frequently used strategy to achieve further blood pressure reduction. An additional agent that acts on catecholamine synthesis may also be considered for a short perioperative window to further stabilise haemodynamics. The complete regimen — including agent selection, sequencing, and the full perioperative plan — is available in the structured protocol.
References
DOI: 10.1210/jc.2014-1498
- Calcium channel blockers are the most often used add-on drug class to further improve blood pressure control in patients already treated with α-adrenergic receptor blockers.
- α-Methyl-paratyrosine (metyrosine) inhibits catecholamine synthesis and may be used in combination with α-adrenergic receptor blockers for a short period before surgery to further stabilize blood pressure to reduce blood loss and volume depletion during surgery.
- Based on retrospective studies and institutional experience, a target blood pressure of less than 130/80 mm Hg while seated and greater than 90 mm Hg systolic while standing seems reasonable, with a target heart rate of 60–70 bpm seated and 70–80 bpm standing.
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