A 54-Year-Old Woman with Advanced Emphysema from Long-Term Cigarette Smoking

question 1

Short Answer

A 54-year-old woman with advanced emphysema from long-term cigarette smoking is admitted to the hospital for shortness of breath. She is diagnosed with pulmonary hypertension. Her arterial blood gases are: $\begin{array} { l } \mathrm { PO } _ { 2 } = 75 \mathrm {~mm} \mathrm { Hg } \\\mathrm { PCO } _ { 2 } = 45 \mathrm {~mm} \mathrm { Hg } \\\mathrm { pH } = 7.35\end{array}$
What is the cause of her pulmonary hypertension?
A. Increased alveolar $\mathrm { pCO } _ { 2 }$
B. Increased sympathetic tone
C. Decreased alveolar $\mathrm { pO } _ { 2 }$
D. Decreased pulmonary capillary number

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