dromlakhani Preoperative Alpha-Blocker Dose Titration for PPGL
STEP 1 — Gather Information
Collect baseline sitting and standing blood pressure, heart rate, symptoms of orthostatic hypotension, current alpha-blocker dose and timing, any adverse effects, and confirm functional PPGL (catecholamine excess) via biochemical testing.
STEP 2 — Rule In / Rule Out
Is sitting systolic BP ≥130 mmHg or diastolic ≥80 mmHg? If yes, proceed to titration; if no, consider dose reduction or hold and reassess in 24 hours.
STEP 3 — Classify or Stratify
Classify response as: (a) BP above target without hypotension → increase dose; (b) BP at target → maintain dose; (c) symptomatic orthostatic hypotension → reduce dose or hold.
STEP 4 — Decide
Increase dose by 1–2 mg of doxazosin (or equivalent) every 2–3 days until sitting BP <130/80 mmHg is reached; if orthostatic hypotension develops, reduce dose by 50% or hold and re‑evaluate before further titration.
Clinical Guardrails / Mimics / Pitfalls
Do not initiate beta‑blockers before adequate alpha‑blockade; avoid exceeding 16 mg/day doxazosin without specialist advice; ensure normal salt intake (≈9 g/day) and consider saline infusion if volume depleted; monitor for severe hypotension, reflex tachycardia, or worsening hypertension; do not titrate based solely on supine BP without orthostatic checks.
Concrete Clinical Example
A 48‑year‑old with biochemically confirmed PPGL starts doxazosin 2 mg at bedtime. After 3 days sitting BP is 150/94 mmHg, no orthostatic symptoms → increase to 4 mg nightly. After another 3 days BP is 138/86 mmHg → increase to 6 mg nightly. After 3 days BP is 126/78 mmHg and standing systolic is 92 mmHg → hold dose; continue same dose until surgery.
Source: Japan Endocrine Society Clinical Practice Guideline for the Diagnosis and Management of Pheochromocytoma and Paraganglioma 2025, Japan Endocrine Society, 2025, DOI:10.1507/endocrj.EJ25-0165