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Methamphetamine-Associated ICH — RACP Adult Medicine MCQ

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HardEmergency MedicineMethamphetamine-Associated ICHRACP Adult Medicine

A 40-year-old man presents with acute onset severe headache, seizure, and right hemiparesis. He has been using intranasal methamphetamine. CT brain shows a left-sided intracerebral haemorrhage. His BP is 240/140 mmHg. What is the most important consideration regarding his BP management?

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Correct answer: E — Avoid beta-blockers due to risk of unopposed alpha stimulation – use benzodiazepines first

In methamphetamine-associated ICH, the hypertension is driven by massive sympathomimetic surge. Beta-blockers (including labetalol, despite having alpha-blocking properties) carry theoretical risk of worsening hypertension through unopposed alpha stimulation (similar to cocaine). IV benzodiazepines (midazolam, diazepam) should be administered FIRST to reduce sympathetic drive, followed by direct vasodilators (GTN, nicardipine, or phentolamine) if BP remains elevated. Sodium nitroprusside is an alternative but carries cyanide toxicity risk.

Reference: eTG – 2025 – Toxicology; Stroke Foundation – 2024 – ICH Guidelines