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Opioid Analgesics | 마이메르시 MyMerci
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Opioid Analgesics

NCLEX Review Guide: Opioid Analgesics in Neurologic Care

Opioid Analgesics Overview

Mechanism of Action & Classifications

  • Opioids bind to mu, kappa, and delta receptors in the brain and spinal cord to block pain transmission and alter pain perception.
  • Natural opioids include morphine and codeine, while synthetic opioids include fentanyl, oxycodone, and hydromorphone.
  • Opioid agonists provide full receptor activation, while partial agonists like buprenorphine have a ceiling effect for respiratory depression.

Memory Aid: MORPHINE Effects

Miosis (pinpoint pupils)
Orthostatic hypotension
Respiratory depression
Pain relief
Hypotension
Increased intracranial pressure
Nausea/vomiting
Euphoria

Key Points

  • Respiratory depression is the most serious adverse effect - monitor respiratory rate, depth, and oxygen saturation
  • Tolerance develops to analgesic effects but NOT to respiratory depression or constipation
  • Physical dependence is different from addiction - expect withdrawal symptoms if discontinued abruptly

Neurologic Considerations

Central Nervous System Effects

  • Opioids can increase intracranial pressure by causing cerebral vasodilation and potentially masking neurologic assessment findings.
  • Sedation occurs before respiratory depression, making it an important early warning sign for nurses to monitor.
  • Opioids can cause confusion, especially in elderly patients, and may precipitate delirium in vulnerable populations.

Clinical Scenario

A 45-year-old patient with traumatic brain injury is experiencing severe pain. The physician orders morphine 2mg IV every 4 hours PRN. What are your priority assessments?

Priority: Neurologic status (Glasgow Coma Scale), respiratory rate/depth, blood pressure, and intracranial pressure signs before and after administration.

Opioid Comparison for Neurologic Patients

MedicationDurationNeurologic Considerations
Morphine3-4 hoursIncreases ICP, histamine release
Fentanyl30-60 minMinimal ICP effect, rapid onset
Hydromorphone2-3 hoursLess histamine release than morphine

Nursing Interventions & Safety

Critical Monitoring Parameters

  1. Assess pain level using 0-10 scale before and 30-60 minutes after administration
  2. Monitor respiratory rate, depth, and oxygen saturation every 15 minutes for first hour
  3. Check blood pressure and heart rate for hypotension and bradycardia
  4. Evaluate level of consciousness and neurologic status
  5. Document effectiveness and any adverse reactions

Naloxone (Narcan) Administration

Dose: 0.4-2mg IV/IM/SubQ every 2-3 minutes
Remember: Naloxone has shorter half-life than most opioids - patient may re-sedate
Watch for: Acute withdrawal symptoms and return of severe pain

Key Points

  • Never leave naloxone at bedside - it requires nursing administration and monitoring
  • Constipation prevention is essential - start bowel regimen with first opioid dose
  • Sedation scale: 0=awake, 1=slightly drowsy, 2=occasionally drowsy, 3=frequently drowsy, 4=somnolent

Common Pitfalls & Study Tips

Frequently Confused Concepts

Physical Dependence vs. Addiction

Physical DependenceAddiction
Normal physiologic responseCompulsive drug-seeking behavior
Withdrawal occurs with discontinuationLoss of control over drug use
Expected with therapeutic usePsychological craving component

Common Pitfalls

  • Confusing tolerance with addiction - tolerance is normal and expected
  • Thinking naloxone reversal is permanent - monitor for re-sedation
  • Forgetting that opioids mask neurologic symptoms in head injury patients
  • Not recognizing that elderly patients are more sensitive to opioid effects

Quick Assessment Checklist

Respiratory rate >12/min
Oxygen saturation >95%
Patient arousable
Blood pressure stable
Pain level documented
Bowel regimen initiated

Remember: You're preparing to be a safe, competent nurse who protects patients while providing compassionate pain management. Trust your knowledge and clinical judgment - you've got this!

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