You have a female patient with a long history of COPD who complains of worsening shortness of breath. She is on continuous 2 LPM of home oxygen. You are concerned that increasing the oxygen flow may eliminate the hypoxic drive to breathe because the hypoxic drive is regulated by

(A) high PaO2.
(B) low PaO2.
(C) high oxygen saturation.
(D) low oxygen saturation.

Ans: (B) low PaO2.

Health Professions

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