The physician suggests that surgery be performed for patent ductus arteriosus (PDA) to prevent which complication?
a. Hypoxemia
b. Right-to-left shunt of blood
c. Decreased workload on the left side of the heart
d. Pulmonary vascular congestion
ANS: D
In PDA, blood flows from the higher pressure aorta into the lower pressure pulmonary vein, resulting in increased pulmonary blood flow. This creates pulmonary vascular congestion. Hypoxemia usually results from defects with mixed blood flow and decreased pulmonary blood flow. The shunt is from left to right in a PDA. The closure would stop this. There is increased workload on the left side of the heart with a PDA.
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