38- A client with chronic obstructive pulmonary disease (COPD) presented with shortness of breath

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38- A client with chronic obstructive pulmonary disease (COPD) presented with shortness of breath. Oxygen therapy was started at 2 liters/minute via nasal cannula. The arterial blood gases (ABGs) after treatment were; ph 7.36, PaO2 62, PaCO2 59, and HCO3. Which statement describes the most likely cause of the simultaneous increase in both the PaO2 and the PaCO2?

a.     The hypercapnia resulted from the rapid respirations.

b.     The hypoxic drive was reduced by the oxygen therapy.

c.     The client had a pneumothorax which restricted ventilation.

d.     The client a pulmonary embolism that reduced perfusion.