# A nurse is caring for a patient receiving morphine sulfate via patient-controlled analgesia (PCA) pump. Which nursing intervention is the highest priority to ensure patient safety?

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> language: ko  
> subject: Pharmacology

## 문제

A nurse is caring for a patient receiving morphine sulfate via patient-controlled analgesia (PCA) pump. Which nursing intervention is the highest priority to ensure patient safety?

## 보기

1. Monitor respiratory rate and oxygen saturation every 2 hours and assess level of consciousness **✔ 정답**
2. Encourage the patient to use the PCA pump frequently to stay ahead of pain
3. Check the PCA pump settings once per shift to ensure proper functioning
4. Educate family members on how to press the PCA button when the patient is sleeping

**정답: 1**

## 해설

Monitoring respiratory rate, oxygen saturation, and level of consciousness every 2 hours is critical to detect opioid-induced respiratory depression early. Other interventions (encouraging frequent use, family assistance, pump checks) are less prioritized for immediate safety.

## 심화 해설

Core Nursing Explanation
**Key Concept Analysis**: This question assesses the priority nursing intervention for a patient on a Patient-Controlled Analgesia (PCA) pump with morphine sulfate. The core safety concern with opioid administration is respiratory depression. Morphine, a potent opioid agonist, binds to mu receptors in the central nervous system, which suppresses the brainstem's respiratory centers. This can lead to a decreased respiratory rate (bradypnea), decreased tidal volume, and potentially life-threatening hypoxia. Therefore, the nurse's primary role is vigilant monitoring to prevent this adverse effect.

**Answer Rationale**: Key Point! Option 1 is correct because it directly addresses the most serious and immediate risk associated with opioid PCA therapy. Monitoring respiratory rate and oxygen saturation (SpO2) every 2 hours is a standard, evidence-based practice to detect early signs of respiratory depression. Assessing the level of consciousness (LOC) is also crucial, as sedation precedes significant respiratory depression. Early detection allows for timely intervention, such as administering naloxone (Narcan), an opioid antagonist.

**Distractor Analysis**:

Watch out for confusion! Option 2: While adequate pain control is important, encouraging *frequent* use without proper assessment can lead to over-sedation and respiratory depression. The principle of PCA is for the patient to self-administer within safe lockout intervals; the nurse's role is to assess pain and effectiveness, not to encourage indiscriminate use.

Option 3: Checking the PCA pump for proper settings and function is essential but is a **secondary safety measure**. A malfunctioning pump could deliver an incorrect dose, but the primary threat to the patient's immediate safety is the drug's physiological effect, not the equipment. Pump checks are typically done at the beginning of each shift and as needed.

Option 4: This is a **critical safety violation**. Only the patient should press the PCA button. Family members or nurses activating the pump ("PCA by proxy") bypasses the built-in safety mechanism where a sedated patient becomes unable to self-administer, which is a natural guard against overdose. This practice is strictly contraindicated.

**Related Concepts**: This integrates knowledge of opioid pharmacology, pain management principles, and patient safety. Understanding the nursing process is key: Assessment (monitoring vitals) always comes before Implementation (educating, encouraging) when safety is at stake.

Concept Summary

| Concept | Key Takeaway |
| --- | --- |
| PCA Safety | Only the patient activates the button. Monitor for respiratory depression (RR, SpO2, LOC) as the highest priority. |
| Opioid Side Effects | Respiratory depression, sedation, constipation, nausea/vomiting, pruritus (itching). |
| Naloxone (Narcan) | Opioid antagonist used to reverse respiratory depression. Rapid administration is lifesaving. |
| Pain Assessment | Use a pain scale (e.g., 0-10). Assess before and after PCA use to evaluate efficacy. |

Side-by-Side Comparison!

| Priority for Opioid PCA | Important but Lower Priority | Contraindicated / Dangerous |
| --- | --- | --- |
| Monitor RR, SpO2, LOC q2h | Assess pain level and PCA effectiveness | Family member presses PCA button |
| Have naloxone available | Check IV site for patency and signs of infiltration | Encouraging "frequent" use without assessment |
| Assess for sedation (using a scale like Pasero Opioid-Induced Sedation Scale) | Educate patient on proper PCA use (self-only, purpose of lockout) | Increasing basal rate without order for uncontrolled pain |

Anatomy, Physiology & Pharmacology Points

- **Physiology/Patho**: Opioids act on mu receptors in the brainstem, depressing the medullary respiratory center. This reduces the sensitivity to carbon dioxide (CO2), leading to hypoventilation and potential respiratory acidosis.

- **Pharmacology**: Morphine sulfate is a prototype opioid agonist. Its effects are dose-dependent. The PCA pump allows for a small bolus dose with a lockout interval (e.g., 1 mg every 10 minutes) to prevent overdose.

- **Antidote**: Naloxone competitively binds to opioid receptors, reversing effects within minutes. It has a shorter half-life than morphine, so re-dosing or continuous monitoring may be needed.

Memory Tips

- **ABCs First!** Airway, Breathing, Circulation. Respiratory depression is a "B" problem, making it the top priority.

- **PCA = Patient Controlled ONLY**. Remember: "Proxy PCA = Perilous Patient Complication."

- **M.O.R.P.H.I.N.E.** side effects: Miosis (pinpoint pupils), Oxygen saturation down, Respiratory depression, Pruritus, Hypotension, Ileus (constipation), Nausea/vomiting, Euphoria/sedation.

High-Frequency NCLEX Topics
The NCLEX heavily tests **priority-setting** and **patient safety**. Opioid/PCA questions are classic for this. You must be able to distinguish between a correct action (monitoring) and a tempting but incorrect action that seems helpful (like having family assist). Always ask yourself: "What is the greatest immediate threat to this patient's life?"

Watch Out for Question Variations!

- Instead of "highest priority intervention," the question may ask: "The nurse should monitor for which **adverse effect**?" (Answer: Respiratory depression).

- The scenario may change: "A patient on a morphine PCA has a respiratory rate of 8 breaths/min and is difficult to arouse. What is the nurse's **first action**?" (Answer: Administer naloxone per protocol/order and call for help).

- It may test knowledge of **contraindications**: "Which patient statement indicates a need for further teaching about the PCA pump?" (Answer: "My wife will push the button for me if I'm asleep.").

## 임상 시나리오

Nursing Clinical Practice Guide
**Clinical Scenario**: You are assigned to Mr. Johnson, a 65-year-old post-operative day 1 after a total knee replacement. He has a morphine PCA pump running. During your initial assessment, he is drowsy but arousable to voice, his pain is rated as 3/10, respiratory rate is 14, and SpO2 is 96% on room air. Two hours later, you find him snoring loudly and difficult to arouse.

**Nursing Intervention Strategy**:

- **Immediate Assessment (ABCs)**: Gently but firmly attempt to arouse the patient. If he does not respond adequately, stimulate him by saying his name and shaking his shoulder. Simultaneously, assess his respiratory rate and depth. Count for a full 30 seconds. Check his oxygen saturation. You note his RR is now 8 and shallow, and SpO2 is 88%.

- **Immediate Action**: This is a potential opioid overdose. Your first action is to **stop the PCA pump** (turn it off or disconnect the tubing from the IV site). Call for help (activate the call light, ask a colleague to get the rapid response team/provider).

- **Administer Reversal Agent**: Prepare and administer naloxone (Narcan) per hospital protocol or provider order (often 0.4 mg IV push). Be prepared to support ventilation with a bag-valve-mask if apnea occurs.

- **Re-assessment & Monitoring**: After naloxone administration, closely monitor the patient's respiratory status, LOC, and pain level. Naloxone's effects wear off faster than morphine, so the patient may re-sedate. Continuous monitoring and possibly a naloxone drip may be needed.

- **Documentation & Communication**: Document the event thoroughly: patient's condition before and after, vital signs, actions taken (pump stopped, naloxone given), and notification of the provider.

**Patient Safety and Precautions**:

- **Never delegate PCA button activation** to anyone but the patient. Reinforce this education with both the patient and family upon initiation.

- Use a validated sedation scale (e.g., Pasero scale) in addition to routine monitoring to catch increasing sedation early.

- Know the location of emergency equipment (naloxone, bag-valve-mask) and reversal protocols.

- For patients with comorbidities like sleep apnea, COPD, or renal/liver impairment, the risk of respiratory depression is higher. Monitor even more vigilantly.

Nursing Procedure & Medication Flow
**PCA Pump Management & Naloxone Administration**:

| Step | Action | Rationale & Key Points |
| --- | --- | --- |
| PCA Initiation | Verify the "5 Rights" of medication. Program pump with correct drug, concentration, bolus dose, lockout interval, and any basal rate (if ordered). Have a second nurse independently double-check. | Prevents programming errors leading to overdose. Lockout interval (e.g., 6-10 min) is a critical safety feature. |
| Ongoing Monitoring | Assess and document q2h (or per protocol): RR, SpO2, LOC, pain score, sedation score, IV site. Review pump history for number of attempts/deliveries. | Early detection of respiratory depression. High number of attempts with few deliveries may indicate inadequate pain control. |
| Naloxone Administration | Draw up 0.4 mg (1 mL of standard 0.4 mg/mL vial). Administer IV push slowly. Have second dose ready. Monitor closely for abrupt pain return and withdrawal symptoms. | Reverses respiratory depression. Administer slowly to minimize precipitating acute pain and sympathetic crisis (agitation, hypertension, tachycardia). |

A Word from Your Senior Nurse
"Managing a patient on a PCA pump is a perfect example of the nurse's dual role as a caregiver and a safety officer. You are empowering the patient to manage their pain while standing guard against the drug's most dangerous side effect. Trust your assessment skills. If something feels 'off'—if the patient is too sleepy, or their breathing seems too slow or shallow—act immediately. Don't wait for the next scheduled check. That moment of vigilance is what separates a task-oriented nurse from a true patient advocate. On the NCLEX, they are testing if you have this safety-first mindset. Always prioritize the intervention that protects the patient's life and airway above all else."

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