## Opioid Overdose Management **Key Point:** Naloxone is a competitive opioid antagonist and the gold standard for acute opioid toxicity, regardless of chronic opioid use history. ### Clinical Presentation Recognition This patient exhibits the classic **opioid toxicity triad**: 1. Respiratory depression (RR 8/min, SpO₂ 78%) 2. Pinpoint pupils (miosis) 3. Altered mental status (CNS depression) ### Naloxone Dosing & Administration - **Initial dose:** 0.4–2 mg IV push - **Repeat interval:** Every 2–3 minutes - **Maximum cumulative dose:** 10 mg (though higher doses may be needed in severe overdose) - **Onset:** 1–2 minutes IV; 2–3 minutes IM/SC - **Duration:** 30–90 minutes (shorter than most opioids → redosing may be needed) **High-Yield:** Naloxone works even in opioid-tolerant patients. The fear of precipitated withdrawal in chronic users does NOT contraindicate its use when life-threatening respiratory depression is present. ### Why Immediate Naloxone? - Respiratory depression is immediately life-threatening - Naloxone rapidly reverses opioid effects at the mu receptor - Even if mechanical ventilation is needed, naloxone should be given simultaneously, not sequentially - The benefit of reversing hypoxia and hypercapnia far outweighs the discomfort of acute withdrawal **Clinical Pearl:** Withdrawal (agitation, tachycardia, hypertension, diaphoresis) is uncomfortable but not immediately lethal. Respiratory depression is immediately lethal. Always prioritize oxygenation. ### Post-Reversal Management - Monitor closely for re-sedation (naloxone duration < opioid duration) - Consider continuous naloxone infusion in severe cases - Supportive care: oxygen, IV fluids, cardiac monitoring - Address underlying cause (accidental overdose vs. intentional) [cite:Harrison 21e Ch 395]
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