Which of the following is NOT a component of Tetralogy of Fallot?

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Multiple Choice

Which of the following is NOT a component of Tetralogy of Fallot?

Tetralogy of Fallot is defined by four structural heart abnormalities that together produce cyanosis: a ventricular septal defect, pulmonary stenosis, an overriding aorta, and right ventricular hypertrophy. The ventricular septal defect provides a route for mixing of blood, and the pulmonary stenosis reduces blood flow to the lungs, increasing right-to-left shunting. The overriding aorta sits above the VSD and can receive blood from both ventricles, and the chronic outflow obstruction causes the right ventricle to hypertrophy. An atrial septal defect is not part of these four features; it’s an atrial-level defect and does not define Tetralogy of Fallot.

Tetralogy of Fallot is defined by four structural heart abnormalities that together produce cyanosis: a ventricular septal defect, pulmonary stenosis, an overriding aorta, and right ventricular hypertrophy. The ventricular septal defect provides a route for mixing of blood, and the pulmonary stenosis reduces blood flow to the lungs, increasing right-to-left shunting. The overriding aorta sits above the VSD and can receive blood from both ventricles, and the chronic outflow obstruction causes the right ventricle to hypertrophy. An atrial septal defect is not part of these four features; it’s an atrial-level defect and does not define Tetralogy of Fallot.

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