In Tetralogy of Fallot, what are the four abnormalities

Ventricular septal defect → there is a hole between the two chambers of the heart known as the ventricles Overriding aorta Pulmonary stenosis Right ventricular hypertrophy So basically this leads to increase in pressure in the right side of the heart so there is right to left shunting due to the septal defect so there is mixing of deoxygenated blood with oxygenated blood leading to a cyanotic defect