Benefits of properly applied O2 therapy in patients with chronic hypoxemia include which of the following?
1. Reversal of pulmonary vasoconstriction
2. Relief of pulmonary hypertension
3. Decreased right ventricular workload
4. Improved pulmonary vital capacity
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: B
Oxygen therapy can reverse pulmonary vasoconstriction and decrease right ventricular workload.
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