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    Learn more about a rare condition caused by a combination of four heart defects that are present at birth (congenital).

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    • #TetralogyOfFallot is a congenital heart defect that affects normal blood flow through the heart. Infants and children with tetralogy of Fallot can have bluish-looking skin because their blood doesn’t carry enough oxygen. Learn more. https://t.co/zPfCJ6GqXw @MayoClinicCV https://t.co/RmXKXjhLME