A patient with COPD is receiving oxygen through a nasal cannula at 4 L/min. The patient becomes drowsy and respiratory rate drops to 8/min. What is the most appropriate nursing action?

1. A

   Increase oxygen flow to 8 L/min

2. B

   Stop oxygen immediately

3. C

   Encourage deep breathing only

4. D

   Notify the physician and monitor ABG

Appeared in: NORCET 8 Prelims-2025

Explanation

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• The patient's drowsiness and decreased respiratory rate (8/min) after receiving oxygen are classic signs of oxygen-induced hypercapnia (CO2 narcosis), a known complication in some COPD patients.
• This condition occurs when supplemental oxygen removes the 'hypoxic drive' to breathe, leading to CO2 retention and respiratory depression.
• This is a medical emergency requiring immediate escalation to the physician for evaluation and new orders.
• Preparing for an Arterial Blood Gas (ABG) analysis is a crucial part of the correct action, as it is the definitive test to confirm hypercapnia (elevated PaCO2) and guide further treatment.

Why Other Options Were Wrong

• Option A: Increasing the oxygen flow would worsen the suppression of the patient's hypoxic drive, leading to more severe CO2 retention, increased drowsiness, and potentially respiratory arrest.
• Option B: Abruptly stopping oxygen is dangerous as it can lead to severe and rapid hypoxemia, which is also life-threatening. The goal is to carefully titrate oxygen down, not cease it completely.
• Option C: This action is insufficient for a serious physiological crisis. A drowsy patient will be unable to cooperate effectively, and verbal encouragement does not address the underlying cause of the respiratory depression.

Related Visual

• Visual 1: Flowchart: Pathophysiology of Hypoxic Drive in COPD. This visual would illustrate how chronic high CO2 desensitizes central chemoreceptors, making peripheral chemoreceptors (sensitive to low O2) the primary drive to breathe, and how supplemental O2 can disrupt this.
• Visual 2: Infographic: Safe Oxygen Administration in COPD. This would highlight the target SpO2 range (88-92%), signs of CO2 narcosis (drowsiness, headache, confusion, decreased RR), and the principle of 'start low, go slow' with oxygen delivery.

Clinical Relevance

• Nursing practice connection: Knowing Complications of Oxygen Therapy in COPD helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• In clinical practice, the rule for oxygen in known or suspected CO2 retainers is 'start low and go slow.' The goal is to treat hypoxemia without suppressing the respiratory drive, typically targeting an SpO2 of 88-92%.
• Any COPD patient on oxygen who becomes newly confused, lethargic, or drowsy must be immediately assessed for hypercapnia. This is a critical patient safety issue.
• What if? If the patient's respiratory rate was 14/min and they were complaining of increased shortness of breath but remained fully alert, the nurse's first action might be to check SpO2, ensure the cannula is positioned correctly, and raise the head of the bed before notifying the physician. The change in consciousness is the critical factor that elevates this situation to an emergency requiring immediate physician notification.

How to Approach the Question

• Identify the patient's primary diagnosis: Chronic Obstructive Pulmonary Disease (COPD).
• Note the current intervention: Oxygen at 4 L/min.
• Analyze the patient's response: Drowsiness (a change in LOC) and a drop in respiratory rate to 8/min (bradypnea).
• Connect the diagnosis, intervention, and response: Recognize these as classic signs of a known complication—oxygen-induced hypercapnia, where administered oxygen suppresses the 'hypoxic drive' in some COPD patients.
• Evaluate the options based on safety and priority. The most critical action for a deteriorating patient is to escalate care by notifying the physician. Actions that would worsen the condition (increasing O2) or are insufficient (deep breathing) are incorrect.

Concept Tested & Keywords

• Concept Tested: Complications of Oxygen Therapy in COPD
• Stem keywords: COPD, oxygen, nasal cannula, 4 L/min, drowsy, respiratory rate 8/min
• Lead-in keywords: most appropriate nursing action
• Clinical cues: Patient with COPD indicates a risk for altered respiratory drive.
• Clinical cues: Drowsiness signifies a change in level of consciousness, a critical finding.

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