A nurse admitting a patient with a history of emphysema reviews her past lab reports and notes that the patient's PaCO2 has been 56 to 64 mmHg. The nurse will be cautious administering oxygen because:
A) The patient's calcium will rise dramatically due to pituitary stimulation.
B) The oxygen will increase the patient's intracranial pressure and create confusion.
C) The oxygen may cause the patient to hyperventilate and become acidotic.
D) Using oxygen may result in the patient developing carbon dioxide narcosis and hypoxemia.
Ans: D
Feedback: When PaCO2 chronically exceeds 50 mm Hg, it creates insensitivity to CO2 in the respiratory medulla, and the use of oxygen may result in the patient developing carbon dioxide narcosis and hypoxemia. Option A is incorrect; there is no information that indicates the patient's calcium will rise dramatically due to pituitary stimulation. Option B is incorrect; there is no feedback system that oxygen stimulates that would create an increase in the patient's intracranial pressure and create confusion. Option C is incorrect; increasing the oxygen would not stimulate the patient to hyperventilate and become acidotic. Rather, it would cause hypoventilation and acidosis.
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