Acute Intoxication and Abuse of Opioids – Principles of Treatment
Acute opioid intoxication is a medical emergency that may lead to respiratory depression, coma, and death. Early recognition and intervention are essential to reduce morbidity and mortality.
Initial Assessment and Stabilization
Follow ABCs (Airway, Breathing, Circulation)
A – Airway
- Ensure airway is open and patent.
- Use suction, airway adjuncts, or endotracheal intubation if necessary.
B – Breathing
- Administer supplemental oxygen.
- Assist ventilation if needed; consider non-invasive or mechanical ventilation.
- Monitor oxygen saturation.
C – Circulation
- Monitor vital signs.
- Establish IV access.
- Administer IV fluids or vasopressors if hypotension is present.
Neurological Assessment
- Use Glasgow Coma Scale (GCS) to assess level of consciousness.
- Key clinical signs of opioid intoxication:
- Miosis (pinpoint pupils)
- Decreased consciousness
- Respiratory depression (RR <12/min, shallow breathing)
Administration of Antidotes
Naloxone
- Route: Intranasal, IM, SC, or IV depending on situation
- Initial Dose:
- 0.4–2 mg IV/IM/SC every 2–3 minutes if no response
- Intranasal: 2–4 mg, repeat every 2–3 minutes if needed
- Higher doses may be required for synthetic opioids (e.g., fentanyl)
Mechanism:
- Competitive μ-opioid receptor antagonist.
- Displaces opioids from receptors to reverse CNS/respiratory depression.
Important: Naloxone has a shorter half-life than many opioids.
Repeated dosing or continuous infusion may be needed to prevent recurrence.
Supportive Care
Monitoring
- Continuous monitoring of:
- Vital signs
- Respiratory rate
- Oxygen saturation
- Level of consciousness
- Capnography: Use to detect early hypoventilation (via end-tidal CO₂)
Respiratory Support
- Supplemental oxygen.
- Escalate to non-invasive or mechanical ventilation if respiratory failure occurs.
Cardiovascular Support
- IV fluids for hypotension.
- Vasopressors (e.g., norepinephrine) if unresponsive to fluids.
Summary Flow
1. ABCs → 2. Neurological Signs → 3. Administer Naloxone → 4. Continuous Monitoring & Support → 5. Prevent Relapse
RECAP QUESTIONS
- 1. Which clinical triad suggests opioid overdose?
- 2. What is the mechanism of action of naloxone?
- 3. Why may multiple doses of naloxone be required in some opioid poisonings?
- 4. What monitoring tool can detect early hypoventilation in opioid-intoxicated patients?
- 5. When should you consider using vasopressors in opioid overdose management?