A client with a history of chronic obstructive pulmonary disease (COPD) is receiving oxygen at 6 L/min via nasal cannula. The nurse observes the client is becoming increasingly lethargic and confused, with shallow respirations. What is the nurse's most appropriate initial action?
- AIncrease the oxygen flow rate to improve oxygenation.
- BContinue monitoring the client and document findings.
- CLower the oxygen flow rate and encourage deep breathing.
- DPrepare for immediate endotracheal intubation.
Show answer & explanationAnswer & explanation
Correct answer: C. Lower the oxygen flow rate and encourage deep breathing.
Clients with severe COPD often rely on a hypoxic drive to breathe. High-flow oxygen can suppress this drive, leading to hypoventilation, CO2 retention, and worsening respiratory acidosis, manifesting as lethargy and confusion. The most appropriate initial action is to lower the oxygen flow rate to a level that maintains adequate oxygenation without suppressing the respiratory drive, typically 1-2 L/min, and encourage deep breathing to improve alveolar ventilation.
Why the other options are wrong
- A. Increasing oxygen in a client with COPD who relies on hypoxic drive can worsen CO2 retention and lead to respiratory arrest.
- B. The client's condition is deteriorating; simply monitoring is insufficient and delays critical intervention.
- D. While intubation may be necessary in extreme cases, it is not the initial action. The nurse should first try less invasive measures to correct the problem.
Hypoxic Drive in COPD
In severe COPD, the body's primary respiratory drive shifts from responding to high CO2 levels to responding to low O2 levels. Administering high-flow oxygen can remove this hypoxic stimulus, leading to decreased respiratory effort and CO2 retention.
- Normal respiratory drive is stimulated by high arterial PCO2.
- In chronic hypercapnia (COPD), chemoreceptors become desensitized to high CO2.
- Hypoxic drive (low arterial PO2) becomes the primary stimulus for breathing.
- High-flow oxygen can suppress the hypoxic drive, leading to hypoventilation and CO2 narcosis.
Memory trick: COPD: Too Much O2, Breathe No More!