What cardiovascular defect results in obstruction to blood flow?
a. Aortic stenosis
b. Tricuspid atresia
c. Atrial septal defect
d. Transposition of the great arteries
ANS: A
Aortic stenosis is a narrowing or stricture of the aortic valve, causing resistance to blood flow in the left ventricle, decreased cardiac output, left ventricular hypertrophy, and pulmonary vascular congestion. Tricuspid atresia results in decreased pulmonary blood flow. The atrial septal defect results in increased pulmonary blood flow. Transposition of the great arteries results in mixed blood flow.
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