Which congenital heart defect results in increased pulmonary blood flow?
a. Ventricular septal defect
b. Coarctation of the aorta
c. Tetralogy of Fallot
d. Pulmonary stenosis
A
Ventricular septal defect causes a left-to-right shunting of blood, thus increasing pulmonary blood flow. Coarctation of the aorta is a stenotic lesion that causes increased resistance to blood flow from the proximal to distal aorta. The defects associated with tetralogy of Fallot result in a right-to-left shunting of blood, thus decreasing pulmonary blood flow. Pulmonary stenosis causes obstruction of blood flow from the right ventricle to the pulmonary artery. Pulmonary blood flow is decreased.
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