What are the fundamental pathophysiologic events that explain PPHN? 1. Vascular spasm 2. Hypoxemia 3. Increased muscle wall thickness 4. Decreased cross-sectional area
a. 1 and 2 only
b. 2, 3, and 4 only
c. 1 and 3 only
d. 1, 3, and 4 only
ANS: D
There are fundamental types of PPHN: vascular spasm, increased muscle wall thickness, and de-creased cross-sectional area of pulmonary vessels.
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A) I B) I and II C) I, II, and III D) I, II, III, and IV
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Fill in the blank(s) with the appropriate word(s).
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