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Tetralogy of Fallot

Tetralogy of Fallot is a type of congenital heart defect. Congenital means that it is present at birth.

Causes, incidence, and risk factors

Tetralogy of Fallot causes low oxygen levels in the blood. This leads to cyanosis (a bluish-purple color to the skin).

The classic form includes four defects of the heart and its major blood vessels: Continue reading