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Opioid Analgesics | 마이메르시 MyMerci
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Opioid Analgesics

NCLEX Review Guide: Opioid Analgesics

Opioid Analgesics Overview

Mechanism of Action

  • Opioids bind to mu, kappa, and delta receptors in the central nervous system to block pain transmission. They alter pain perception by inhibiting ascending pain pathways and activating descending inhibitory pathways.
  • Morphine is the prototype opioid and all other opioids are compared to its analgesic effects and side effect profile.

Memory Aid: MORPHINE Side Effects

Miosis (pinpoint pupils)
Orthostatic hypotension
Respiratory depression
Physical dependence
Hypotension
Increased intracranial pressure
Nausea/vomiting
Euphoria/sedation

Key Points

  • Respiratory depression is the most serious adverse effect - monitor respiratory rate closely
  • Tolerance develops to analgesic effects but NOT to constipation or miosis
  • Physical dependence ≠ addiction - important distinction for patient care

Common Opioid Classifications

Full Agonists vs Partial Agonists

Full Agonists Partial Agonists
Morphine, Fentanyl, Oxycodone Buprenorphine, Nalbuphine
Maximum analgesic effect Ceiling effect for analgesia
Higher abuse potential Lower abuse potential
Can cause severe respiratory depression Less respiratory depression
  • Fentanyl is 50-100 times more potent than morphine and requires careful dosing calculations and monitoring for respiratory depression.
  • Codeine is a prodrug that must be metabolized to morphine for analgesic effect - some patients lack the enzyme and won't experience pain relief.

Nursing Interventions & Monitoring

Critical Assessments

  1. Assess pain using appropriate scale (0-10 numeric, FACES, etc.) before and after administration
  2. Monitor respiratory rate, depth, and oxygen saturation - hold if RR < 12/min
  3. Check blood pressure and heart rate for hypotension
  4. Assess level of consciousness and pupil size
  5. Monitor bowel sounds and bowel movement patterns

Clinical Scenario

Patient receiving IV morphine 4mg q4h reports pain 8/10. Vital signs: BP 90/60, HR 58, RR 10, O2 sat 94%. Do NOT administer - respiratory depression present. Notify physician immediately and prepare naloxone if ordered.

Key Points

  • Always have naloxone (Narcan) readily available - opioid antagonist
  • Implement fall precautions due to sedation and orthostatic hypotension
  • Prophylactic bowel regimen needed - constipation is inevitable

Commonly Confused Concepts

Physical Dependence vs Addiction vs Tolerance

Physical Dependence Addiction Tolerance
Normal physiologic response Psychological craving/compulsive use Decreased drug effectiveness
Withdrawal symptoms if stopped Continued use despite harm Need higher doses for same effect
Expected with therapeutic use Disease requiring treatment Normal pharmacologic response

Common Pitfalls

  • Never crush extended-release formulations - can cause fatal overdose
  • Respiratory depression peaks 30-90 minutes after IV administration
  • Elderly patients more sensitive - start with lower doses
  • Avoid in patients with severe asthma or respiratory depression

Study Tips & Quick Checks

NCLEX Success Tips

  • Always choose respiratory assessment as priority with opioid questions
  • Safety measures (fall precautions, naloxone availability) are high-priority interventions
  • Remember: treat the pain, monitor for side effects, prevent complications

Quick Check Boxes

  • ☐ Can you identify signs of respiratory depression?
  • ☐ Do you know the antidote for opioid overdose?
  • ☐ Can you differentiate physical dependence from addiction?
  • ☐ Do you understand why constipation prevention is essential?
  • ☐ Can you explain why extended-release forms shouldn't be crushed?

Priority NCLEX Concepts

  • Safety first - respiratory depression is life-threatening
  • Pain management is a patient right and nursing responsibility
  • Prevention of complications through proactive nursing care

You've got this! Master these opioid concepts and you'll confidently tackle NCLEX pharmacology questions. Remember: assess, administer safely, monitor closely, and prevent complications. Your patients are counting on your knowledge and skills!

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