# A nurse is assessing a 72-year-old patient with metastatic bone cancer who has been prescribed opioid analgesics for pain management. Which assessment finding would be the most concerning and require immediate intervention?

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> subject: Pharmacology

## 문제

A nurse is assessing a 72-year-old patient with metastatic bone cancer who has been prescribed opioid analgesics for pain management. Which assessment finding would be the most concerning and require immediate intervention?

## 보기

1. Patient reports pain level of 6/10 on the numeric rating scale
2. Respiratory rate of 8 breaths per minute with shallow breathing pattern **✔ 정답**
3. Patient states feeling drowsy 2 hours after medication administration
4. Blood pressure reading of 110/70 mmHg, decreased from baseline of 130/80 mmHg

**정답: 2**

## 해설

Respiratory rate of 8 breaths per minute with shallow breathing indicates severe respiratory depression, the most life-threatening adverse effect of opioids in elderly patients. Other findings are less urgent.

## 심화 해설

Understanding the Priority: Opioid-Induced Respiratory Depression

The most concerning assessment finding requiring immediate intervention is a respiratory rate of 8 breaths per minute with a shallow breathing pattern. This finding represents a life-threatening adverse effect of opioid therapy that demands prompt recognition and action.

Pathophysiology and Mechanism

Opioid analgesics exert their effects primarily by binding to mu-opioid receptors in the central nervous system. While this action provides effective analgesia, stimulation of these receptors in the brainstem's respiratory centers directly suppresses the ventilatory response to hypercapnia (elevated carbon dioxide) and hypoxia (low oxygen). This blunting of the respiratory drive leads to a progressive reduction in both respiratory rate and tidal volume, manifesting as bradypnea and shallow breathing. The concern is particularly heightened in the geriatric population. As highlighted in the context of perioperative analgesia, research on intrathecal morphine in elderly patients has specifically raised concerns about potential adverse effects, with respiratory depression being a primary safety consideration [1]. This physiological vulnerability makes the elderly patient in this scenario especially susceptible.

Clinical Significance of the Findings

A systematic assessment using the ABC (Airway, Breathing, Circulation) priority framework immediately identifies the respiratory finding as the most critical. A rate of 8 breaths per minute signifies severe bradypnea, indicating that the patient is in a state of profound respiratory depression and is at imminent risk for respiratory arrest. The shallow breathing pattern further confirms that gas exchange is critically compromised, leading to rapid oxygen desaturation and carbon dioxide retention.

The other options, while requiring nursing attention, do not represent the same immediate threat to life:

- A pain level of 6/10 indicates moderate pain that needs to be addressed, but pain itself is not immediately life-threatening. The ongoing clinical trials on opioid alternatives, such as oliceridine and esketamine, are actively seeking to balance effective analgesia with a reduction in these types of serious adverse events [2, 3, 4].

- Drowsiness 2 hours after medication administration is a common and expected sedative side effect of opioids. While it requires monitoring of sedation level, it precedes the more dangerous state of respiratory depression.

- A blood pressure decrease from 130/80 to 110/70 mmHg is a mild, clinically non-significant change that can be attributed to the vasodilatory effects of opioids or pain relief. It does not indicate hemodynamic instability.

Immediate Nursing Actions

Upon identifying a critically low respiratory rate, the nurse's immediate intervention is to stimulate the patient to breathe, administer supplemental oxygen, and prepare for the administration of an opioid antagonist such as naloxone as prescribed. Continuous monitoring of oxygen saturation and end-tidal carbon dioxide, if available, is essential. This clinical vigilance is the cornerstone of safe opioid administration, a principle underscored by the ongoing search for analgesic agents with improved safety profiles in vulnerable populations like the elderly [1, 2, 4].References (research sources)

- [1]Low-Dose Morphine Intrathecal Analgesia in Elderly Patients with Hip Fracture Undergoing Single Spinal Anesthesia: A Randomized Controlled Trial.RCT/clinical trialBuršík D, Romanová T, Lečbychová K, Bílená M, Burda M, Ševčík P, Haiduk F, Frelich M, Káňová M, Máca J. (2026) · DOI: 10.2147/lra.s598583

## 임상 시나리오

Responding to Opioid-Induced Respiratory DepressionImmediate steps for a patient with a respiratory rate below 10/min
The priority is to immediately stimulate the patient and provide ventilatory support. Call for help and administer naloxone, an opioid antagonist, per facility protocol. The initial dose is often 0.4 mg to 2 mg IV, repeated every 2-3 minutes as needed.

While preparing naloxone, use a bag-valve-mask (BVM) to ventilate the patient if their respiratory effort is inadequate. Aim for a rate of 10-12 breaths per minute. Avoid aggressive ventilation to prevent gastric insufflation.

CautionNaloxone has a shorter half-life than many opioids. The patient must be monitored for re-sedation and recurrent respiratory depression for several hours after the last dose. A continuous IV infusion may be required.

## 핵심 개념

- **Opioid-Induced Respiratory Depression** — A dangerous decrease in breathing rate and depth that can be life-threatening, caused by opioid drugs suppressing the respiratory control center in the brainstem.
- **Naloxone** — It is an emergency medication that acts as an opioid receptor antagonist and rapidly reverses respiratory depression in cases of opioid overdose.
- **Sedation** — In a sedated state, it is a common side effect of opioids and can be a precursor symptom that may progress to respiratory depression.
- **Chronic Osteoarthritis** — Degenerative joint disease, a common cause of chronic pain, may require opioid prescriptions in the elderly.
- **Numeric Rating Scale** — A tool for assessing pain intensity, where the patient expresses pain as a number between 0 (no pain) and 10 (worst possible pain).

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