Tetralogy of Fallot is a birth defect of the heart consisting of four abnormalities that results in insufficiently oxygenated blood pumped to the body. At birth, infants may not show the signs of the cyanosis but later may develop episodes of bluish skin from crying or feeding called "Tet spells".

Review Date: 3/23/2001 12:00:00 AM Reviewed By:A.D.A.M. Medical Illustration Team

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