Pulmonary valve stenosis is a component of which congenital heart disease?

• A. Tetralogy of Fallot
• B. Transposition of the great arteries
• C. Eisenmenger syndrome
• D. Tricuspid atresia

Answer: (A)

Pulmonary stenosis fits with Tetralogy of Fallot because the obstruction of the right ventricular outflow tract is a defining feature of this condition. In Tetralogy of Fallot, the outflow tract narrowing—often infundibular stenosis near the pulmonary valve—combined with a ventricular septal defect, an overriding aorta, and right ventricular hypertrophy creates the classic pattern. The outflow obstruction lowers blood flow to the lungs, promoting a right-to-left shunt across the VSD and resulting in cyanosis. The other conditions involve different primary lesions—swapped great vessel connections in transposition, shunt reversal in Eisenmenger syndrome, or absence of the tricuspid valve in tricuspid atresia—so they don’t hinge on pulmonary valve stenosis as part of their core anatomy.