Tetralogy of Fallot

The tetralogy of Fallot results from the asymmetric division of the AP septum. The result is a stenosed pulmonary artery and a VSD.

The VSD arises from the deviation of the AP septum from the midline. The aorta thus overrides the VSD, allowing a left-right shunt of blood. The tetralogy is thus comprised of the following four defects:

• pulmonary artery/valve stenosis
• ventricular septal defect
• overriding aorta
• right ventricular hypertrophy

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