# A nurse is caring for a postoperative patient using a patient-controlled analgesia (PCA) pump with morphine. Which assessment finding would require immediate nursing intervention?

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> subject: Pharmacology

## 문제

A nurse is caring for a postoperative patient using a patient-controlled analgesia (PCA) pump with morphine. Which assessment finding would require immediate nursing intervention?

## 보기

1. Patient reports pain level of 6 out of 10 on the pain scale
2. PCA pump shows 15 attempts with 8 successful doses in the past 4 hours
3. Patient's blood pressure is 110/70 mmHg, down from baseline of 130/80 mmHg
4. Respiratory rate of 8 breaths per minute with drowsiness **✔ 정답**

**정답: 4**

## 해설

Respiratory depression is the most serious adverse effect of opioids and requires immediate intervention. A respiratory rate of 8 breaths per minute with drowsiness indicates potential overdose, while other findings are expected or less critical.

## 심화 해설

Core Nursing Explanation
**Key Concept Analysis**: This question assesses the nurse's ability to recognize and prioritize the most critical, life-threatening adverse effect of opioid analgesics, specifically in the context of Patient-Controlled Analgesia (PCA). The core theme is patient safety and the principle of Airway, Breathing, Circulation (ABC) in nursing assessment. Opioids like morphine act on the central nervous system to provide analgesia but also depress the respiratory center in the medulla oblongata, leading to Respiratory depression. This is the primary cause of morbidity and mortality associated with opioid use.

**Answer Rationale**: Key Point! A respiratory rate of 8 breaths per minute is significantly below the normal adult range of 12-20 breaths per minute and is a classic sign of opioid-induced respiratory depression. When combined with drowsiness (a sign of central nervous system depression), it indicates a potential overdose that can rapidly progress to apnea, hypoxia, and death. This finding requires immediate nursing intervention, which includes stopping the PCA pump, stimulating the patient, administering the opioid antagonist naloxone (Narcan) as prescribed, and providing respiratory support.

**Distractor Analysis**:

Watch out for confusion! Option ①: A pain level of 6/10 in a postoperative patient using PCA is an expected finding that requires assessment and possibly adjustment of the PCA settings or a non-pharmacological intervention, but it is not an immediate life-threatening emergency.

Option ②: PCA usage data (15 attempts, 8 deliveries) indicates the patient is actively using the pump. This is a normal pattern for effective PCA use and requires monitoring for efficacy and side effects, but not immediate intervention based on those numbers alone.

Option ③: While a drop in blood pressure (from 130/80 to 110/70 mmHg) can be a side effect of opioids due to vasodilation and requires monitoring, a BP of 110/70 is still within a normal range and is not as immediately critical as compromised breathing. The nurse would continue to monitor trends but would not prioritize this over a respiratory rate of 8.

**Related Concepts**: Nursing care for a patient on PCA includes continuous monitoring of respiratory rate, depth, and pattern; level of sedation (using a tool like the Pasero Opioid-Induced Sedation Scale); pain scores; and vital signs. Patient and family education on the safe use of the PCA button (only the patient should press it) is crucial to prevent accidental overdose.

Concept Summary

| Concept | Description | Nursing Implication |
| --- | --- | --- |
| PCA (Patient-Controlled Analgesia) | A system allowing patients to self-administer preset doses of IV opioid analgesia. | Monitor for efficacy (pain relief) and safety (respiratory depression, sedation). |
| Opioid Adverse Effects | Respiratory depression, sedation, hypotension, constipation, nausea/vomiting, urinary retention. | Respiratory depression is the priority concern. Implement preventive measures for others (e.g., stool softeners). |
| Naloxone (Narcan) | Opioid receptor antagonist used to reverse opioid-induced respiratory depression. | Have readily available. Administer per protocol for respiratory rate < 8-10/min or unresponsiveness. |

Side-by-Side Comparison!

| Assessment Finding with PCA | Interpretation & Priority | Required Action |
| --- | --- | --- |
| Respiratory Rate 8/min, Sedated | High Priority / Emergency - Indicates respiratory depression/overdose. | Immediate: Stop PCA, stimulate patient, administer naloxone, call for help, prepare for airway support. |
| Pain Score 6/10 | Medium Priority - Indicates inadequate pain control. | Assess PCA settings, use non-pharm interventions, consider consulting pain team for regimen adjustment. |
| Mild Hypotension (e.g., 100/60) | Low-Moderate Priority - Common opioid side effect. | Monitor trends, ensure patient is not hypovolemic, encourage slow position changes (orthostatic precautions). |

Anatomy, Physiology & Pharmacology Points

- **Physiology/Pharmacology**: Morphine binds to mu-opioid receptors in the brain and spinal cord. While providing analgesia, it also decreases the sensitivity of the brainstem's respiratory centers to carbon dioxide (CO2), leading to hypoventilation.

- **Mechanism of Reversal**: Naloxone is a competitive antagonist at opioid receptors. It has a higher affinity for the receptor than morphine but a shorter duration of action, meaning re-dosing or continuous monitoring is often needed after administration.

Memory Tips

- **ABCs First!** Always assess Airway, Breathing, Circulation before anything else. With opioids, **B**reathing is the biggest risk.

- **Rule of "8"**: A respiratory rate around **8** breaths per minute is a major red flag for opioid overdose requiring intervention.

- **S.A.V.E. the patient on Opioids**: **S**edation level, **A**irway/breathing, **V**ital signs, **E**fficacy of pain relief.

High-Frequency NCLEX Topics
The NCLEX heavily tests **prioritization** and **recognition of adverse drug reactions**. Opioid respiratory depression is a classic "select all that apply" or "priority action" question. Be prepared to choose an action related to airway/breathing over pain management or other vital sign changes.

Watch Out for Question Variations!

- **Shift from Symptom to Intervention**: "The nurse notes a postoperative patient on a morphine PCA has a respiratory rate of 9/min and is difficult to arouse. What is the nurse's *priority* action?" (Answer: Administer naloxone as prescribed.)

- **Shift to Patient Education**: "Which statement by a patient using a PCA pump indicates a need for further teaching?" (Answer: "My family member can press the button for me if I'm sleeping.")

- **Integrating Assessment Tools**: The question could incorporate the Pasero Opioid-Induced Sedation Scale (POSS) and ask which sedation level warrants holding the opioid.

## 임상 시나리오

Nursing Clinical Practice Guide
**Clinical Scenario**: You are the night shift nurse on a surgical unit. Mr. Johnson, 58, is 12 hours post-op from a total knee replacement. He has a morphine PCA pump running. During your 2 AM rounds, you find him snoring loudly. You gently shake his shoulder and call his name; he opens his eyes briefly but falls back asleep. His respiratory rate is 7 breaths per minute and shallow.

**Nursing Intervention Strategy**:

- **Immediate Assessment & Action (Within seconds)**: Key Point! This is an emergency. Stop the PCA pump immediately. Call for help (use the call light or shout for another nurse). Position the patient supine with the head of the bed flat if not contraindicated. Attempt to arouse the patient more vigorously: "Mr. Johnson, open your eyes! Take a deep breath!"

- **Administer Reversal Agent**: While your colleague calls the Rapid Response Team or the physician, you prepare and administer Naloxone (Narcan) IV push per the hospital's protocol or standing order (e.g., 0.4 mg). **Note**: Naloxone's effects last 30-90 minutes, which may be shorter than the opioid's duration, so close monitoring for re-sedation is critical.

- **Support Breathing & Monitor**: Apply supplemental oxygen via nasal cannula or non-rebreather mask. Continuously monitor oxygen saturation, respiratory rate, heart rate, and blood pressure. Prepare suction and bag-valve-mask (BVM) equipment at the bedside.

- **Post-Event Care & Documentation**: Once the patient is stabilized, reassess pain (he will likely be in severe pain as the opioid is reversed). Collaborate with the physician on an alternative pain management plan. Document everything meticulously: baseline status, your assessment findings (RR 7, sedation level), all actions taken (PCA stopped, naloxone dose/time), patient response, and notifications made.

**Patient Safety and Precautions**:

- **Never delegate PCA monitoring** to unlicensed assistive personnel (UAP). Respiratory assessment is a registered nurse's responsibility.

- Ensure **only the patient** presses the PCA button to prevent family-administered overdose.

- Use a validated sedation scale (like POSS) along with pain scores during routine checks (e.g., every 1-2 hours initially).

- Know the location of naloxone and emergency equipment on your unit.

Nursing Procedure & Medication Flow
**Monitoring a Patient on PCA**:

- **Assess**: Q1-2H for first 24 hours: **Respiratory rate and pattern**, Oxygen saturation, Level of sedation (POSS), Pain score (0-10 scale), Vital signs, PCA pump settings and lockout period, IV site.

- **Educate**: "Press the button when you start to feel pain, don't wait for it to become severe. You are in control. No one else should press the button for you. Tell me immediately if you feel extremely sleepy or have trouble breathing."

- **Respond**: For respiratory rate < 10/min or significant sedation (POSS level 3 or 4), follow facility protocol for opioid-induced respiratory depression.

**Administering Naloxone (Narcan) IV Push**:

- Verify order or protocol.

- Draw up prescribed dose (common initial: 0.4 mg in 1 mL).

- Administer IV push slowly over 30 seconds.

- Monitor for **abrupt reversal**: Patient may wake up in severe pain, become agitated, or have nausea/vomiting. Have safety measures and an emesis basin ready.

- Continue monitoring; be prepared to repeat dose every 2-3 minutes if no response, up to a maximum dose.

A Word from Your Senior Nurse
"Remember, our primary goal with pain management is to relieve suffering *safely*. A sleeping patient on opioids isn't always a 'comfortable' patient—they might be overdosing. Trust your assessment skills. That moment when you count a respiratory rate of 8 and see that profound sedation is when your knowledge saves a life. On the NCLEX and in practice, thinking 'ABCs' will never steer you wrong. You are the last line of defense between your patient and respiratory arrest. Own that responsibility with confidence and vigilance."

## 핵심 개념

- **Patient-Controlled Analgesia** — A medication delivery system that allows patients to self-administer predetermined doses of analgesic medication (usually opioids) intravenously or via other routes by pressing a button, within set safety limits (dose, lockout interval).
- **Respiratory Depression** — A potentially life-threatening condition characterized by a reduced rate and/or depth of breathing (hypoventilation), leading to inadequate gas exchange (hypercapnia and hypoxia). It is the most serious adverse effect of opioid analgesics.
- **Naloxone** — An opioid receptor antagonist used as an emergency treatment to completely or partially reverse opioid-induced respiratory depression, sedation, and hypotension. It competes with opioids at receptor sites.
- **Opioid-Induced Sedation Scale** — A validated tool used to assess the level of sedation in patients receiving opioid therapy. Levels range from S (sleep, easy to arouse) to 4 (unarousable). Levels 3 and 4 indicate dangerous sedation requiring intervention.
- **Hypoventilation** — Inadequate ventilation leading to an increase in arterial carbon dioxide (PaCO2). It is the physiological mechanism behind opioid-induced respiratory depression, as the drugs blunt the respiratory center's response to elevated CO2.

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