A 2-week-old infant who presents with poor feeding, fatigue, dyspnea, and a murmur is diag-nosed with a patent ductus arteriosus (PDA). This condition results in a(n):
a. decreased pulmonary blood flow.
b. right-to-left shunt.
c. left-to-right shunt.
d. increased systemic blood flow.
ANS: C
PDA is failure of the fetal ductus arteriosus to close. The continued patency of this vessel allows blood to flow from the higher-pressure aorta to the lower-pressure pulmonary artery, causing a left-to-right shunt. It does not cause decreased pulmonary blood flow. It could decrease systemic blood flow, not increase it.
Health Professions
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