# A nurse is caring for a patient with chronic obstructive pulmonary disease (COPD) who presents with the following arterial blood gas (ABG) results: pH 7.32, PaCO2 58 mmHg, HCO3- 30 mEq/L, PaO2 65 mmHg. The patient appears drowsy and has shallow respirations at 10 breaths per minute, indicating potential respiratory failure. What is the nurse's priority action?

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## 문제

A nurse is caring for a patient with chronic obstructive pulmonary disease (COPD) who presents with the following arterial blood gas (ABG) results: pH 7.32, PaCO2 58 mmHg, HCO3- 30 mEq/L, PaO2 65 mmHg. The patient appears drowsy and has shallow respirations at 10 breaths per minute, indicating potential respiratory failure. What is the nurse's priority action?

## 보기

1. Administer high-flow oxygen at 15 L/min via non-rebreather mask
2. Encourage deep breathing exercises and use of incentive spirometer
3. Position the patient in Trendelenburg position to improve ventilation
4. Assist with mechanical ventilation or bag-mask ventilation **✔ 정답**

**정답: 4**

## 해설

The patient shows signs of respiratory failure (drowsiness, shallow respirations) with respiratory acidosis, requiring immediate ventilatory support. High-flow oxygen or Trendelenburg position can worsen ventilation, and deep breathing exercises are insufficient in this critical state.

## 심화 해설

Clinical Context and ABG Interpretation

The patient with COPD presents with drowsiness and shallow respirations at a rate of 10 breaths per minute. The ABG reveals a pH of 7.32, PaCO₂ of 58 mmHg, and HCO₃⁻ of 30 mEq/L. This pattern indicates a primary acute-on-chronic respiratory acidosis. The pH is below 7.35, confirming acidemia. While the elevated HCO₃⁻ suggests metabolic compensation (likely from chronic CO₂ retention), the pH has not normalized, pointing to an acute decompensation. The elevated PaCO₂ is the primary problem, signifying hypoventilation. The patient's altered mental status (drowsiness) and bradypnea are critical indicators of ventilatory failure, a state where the respiratory muscles can no longer sustain adequate alveolar ventilation to eliminate CO₂.

Priority Action Rationale

In the context of ventilatory failure with hypercapnia and altered consciousness, the immediate priority is to support ventilation to correct the life-threatening respiratory acidosis. The patient's shallow, slow respirations are insufficient. Bag-mask ventilation or preparation for mechanical ventilation provides immediate positive-pressure support, increasing tidal volume and minute ventilation to blow off CO₂ and restore a safer pH. This directly addresses the root cause of the decompensation. The evidence underscores that timely application of ventilatory support, such as non-invasive ventilation (NIV) or invasive mechanical ventilation, is a cornerstone of managing acute exacerbations of COPD with respiratory failure [1]. The interprofessional team, including nurses, respiratory therapists, and physicians, must recognize the signs of impending respiratory arrest and act swiftly to initiate this life-saving intervention.

Analysis of Incorrect Options

- **Administer high-flow oxygen at 15 L/min via non-rebreather mask:** This action is dangerous in a patient with chronic CO₂ retention. While the PaO₂ of 65 mmHg indicates hypoxemia, the primary driver for breathing in some COPD patients may shift from hypercapnia to the hypoxic drive. Uncontrolled high-flow oxygen can suppress the respiratory drive, leading to further hypoventilation, worsening hypercapnia, and potential respiratory arrest. Oxygen therapy must be carefully titrated to a target saturation (often 88-92%) using a controlled device like a Venturi mask.

- **Encourage deep breathing exercises and use of incentive spirometer:** This intervention is inappropriate for a drowsy patient with a declining level of consciousness and severe hypoventilation. An incentive spirometer is designed for patients who are alert, cooperative, and able to follow commands to prevent atelectasis, not to treat acute ventilatory failure. This patient lacks the mental status and respiratory muscle strength to participate in this therapy.

- **Position the patient in Trendelenburg position to improve ventilation:** The Trendelenburg position (head down, feet elevated) would worsen the patient's respiratory status. It forces abdominal contents against the diaphragm, limiting its excursion and further reducing lung volumes and ventilation. The appropriate position to optimize breathing in a COPD patient is upright, such as high-Fowler's or the tripod position, which aids diaphragmatic descent and chest expansion.

References (research sources)

- [1]Analysis of shared cognitive tasks in the application of non-invasive ventilation to patients with COPD exacerbation.Research articleHughes AM, Riska K, Farmer MJS, Krishnakumar D, Shea CM, Hess DR, Lindenauer PK, Stefan MS. (2023) · DOI: 10.1080/13561820.2022.2118681

## 임상 시나리오

Clinical Case: Acute Ventilatory Failure in COPD

**Scenario:** Mr. Thompson, a 68-year-old male with a history of severe COPD, is found drowsy and difficult to arouse. His respiratory rate is 10 breaths per minute with shallow chest rise. Arterial blood gas results show pH 7.32, PaCO2 58 mmHg, HCO3- 30 mEq/L, and PaO2 65 mmHg. The provider suspects acute-on-chronic respiratory acidosis with ventilatory failure.

Nursing Action & Rationale

- **Immediate Priority:** Initiate bag-mask ventilation and prepare for non-invasive (BiPAP) or invasive mechanical ventilation. The patient's altered mental status and bradypnea indicate he cannot sustain adequate alveolar ventilation. Positive-pressure support is required to increase minute ventilation, eliminate CO2, and correct the life-threatening acidosis.

- **Oxygen Therapy:** Titrate oxygen to maintain SpO2 between 88-92% using a Venturi mask or nasal cannula. Avoid high-flow oxygen, which can suppress the hypoxic respiratory drive in chronic CO2 retainers, potentially worsening hypoventilation and hypercapnia.

- **Positioning:** Keep the patient in a semi-Fowler's or upright position to maximize diaphragmatic excursion and lung expansion. Never place a patient in respiratory distress in the Trendelenburg position, as it elevates abdominal contents against the diaphragm, further compromising ventilation.

- **Monitoring:** Continuously monitor respiratory rate, depth, SpO2, end-tidal CO2 if available, and level of consciousness. Prepare for repeat ABG analysis 30-60 minutes after initiating ventilatory support to evaluate the effectiveness of the intervention.

Clinical Pearls

In COPD patients with acute hypercapnic respiratory failure, a decreased level of consciousness is a critical sign of decompensation. Do not delay ventilatory support for patients who are drowsy with bradypnea. Non-invasive ventilation (NIV) is the first-line treatment in a cooperative patient, but a patient with severely altered consciousness or apnea requires immediate bag-mask ventilation and intubation.

## 핵심 개념

- **Ventilatory Failure** — A state in which the respiratory system can no longer maintain adequate alveolar ventilation to eliminate carbon dioxide, leading to hypercapnia and respiratory acidosis.
- **Acute-on-Chronic Respiratory Acidosis** — An acute worsening of acid-base status in a patient with chronic CO2 retention, indicated by a low pH, elevated PaCO2, and a compensatory but insufficient increase in HCO3-.
- **Hypoxic Drive** — A respiratory stimulus in some chronic CO2 retainers where breathing is driven by low oxygen levels rather than high CO2; administering high-flow oxygen can blunt this drive and cause further hypoventilation.
- **Bag-Mask Ventilation** — A manual resuscitation technique using a self-inflating bag and face mask to deliver positive-pressure breaths, providing immediate ventilatory support to a patient with inadequate spontaneous breathing.

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