Why is the use of oxygen to maintain oxygen saturations greater than 90% particularly important in the management of idiopathic pulmonary artery hypertension?
a. These patients have a low cardiopulmo-nary reserve.
b. Low alveolar oxygen causes vasocon-striction.
c. Many patients have central cyanosis.
d. These patients are especially susceptible to tissue hypoxia.
ANS: B
Supplemental oxygen should be used to maintain oxygen saturation greater than 90%, especially because hypoxemia is a major cause of pulmonary vasoconstriction.
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