Postoperative Care for a Client with a Hip Replacement
Mr. Johnson, a 72-year-old male, is 6 hours postoperative from a total hip replacement (left). He has a history of hypertension, type 2 diabetes, and mild cognitive impairment. His vital signs are: BP 142/88, HR 92, RR 20, Temp 37.2°C, SpO2 96% on room air. He has a PCA pump with morphine, a Foley catheter, and an IV of lactated Ringer's at 100 mL/hr. He rates his pain as 6/10 at rest. His left leg is in an abductor pillow. He is drowsy but arousable. The LPN notes that his respiratory rate has decreased from 20 to 12 breaths per minute over the last hour, and his SpO2 is now 92% on room air. The nurse is concerned about opioid-induced respiratory depression.
1. What are the priority nursing actions for this client? Prioritize your interventions and explain your rationale.
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Priority actions:
- Stimulate and reposition: Gently arouse Mr. Johnson, encourage deep breathing, and reposition him to a side-lying or semi-Fowler's position to improve ventilation.
- Assess sedation and respiratory status: Use a sedation scale (e.g., POSS) to evaluate level of consciousness. Count respiratory rate for a full minute, assess depth and pattern, and monitor SpO2 continuously.
- Stop the opioid: Immediately discontinue the PCA pump (or pause it) to prevent further respiratory depression.
- Administer oxygen: Apply supplemental oxygen (e.g., 2 L/min via nasal cannula) to maintain SpO2 ≥94%.
- Notify the provider: Report the change in condition and obtain orders for reversal agent (naloxone) if needed.
- Prepare for naloxone: If respiratory rate remains <8/min or SpO2 <90% despite stimulation, administer naloxone as ordered. Monitor for re-sedation and pain crisis.
- Monitor and document: Reassess vital signs every 5-15 minutes until stable. Document interventions and response.
Rationale: Opioids can cause respiratory depression, especially in older adults with comorbidities. Early recognition and intervention prevent hypoxia and respiratory arrest. Naloxone reverses opioid effects but may precipitate acute pain and withdrawal; use judiciously.
2. What risk factors in Mr. Johnson's history increase his risk for opioid-induced respiratory depression? How would you modify his care to reduce this risk?
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Risk factors:
- Age (72 years): decreased hepatic and renal clearance, increased sensitivity to opioids.
- Mild cognitive impairment: may not reliably report symptoms or self-administer PCA correctly.
- Type 2 diabetes: may have autonomic neuropathy affecting respiratory drive.
- Hypertension: cardiovascular compromise may reduce tolerance to hypoxia.
- Postoperative status: pain, immobility, and residual anesthesia contribute.
- Use of PCA morphine: continuous infusion without clinician boluses can lead to accumulation.
Modifications:
- Use a multimodal analgesia approach: combine opioids with non-opioid analgesics (e.g., acetaminophen, NSAIDs if not contraindicated) and non-pharmacologic methods (ice, positioning).
- Implement hourly sedation and respiratory assessments.
- Consider switching to intermittent opioid dosing rather than continuous PCA.
- Educate the client and family about reporting drowsiness or shortness of breath.
- Collaborate with the provider to adjust opioid dose based on age and renal function.
- Monitor for other opioid side effects (constipation, pruritus) and manage proactively.