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Definition
By Mayo Clinic staffTetralogy of Fallot (fuh-LOE) is an uncommon condition involving defects within the heart structures of infants and young children. Together these defects result in oxygen-poor blood flowing out of the heart and into the body. Consequently, infants and children with tetralogy of Fallot usually have blue-tinged skin.
Tetralogy of Fallot is present at birth and usually diagnosed during infancy. However, it may not be detected until later in life, depending on the severity of the defects and symptoms. Tetralogy of Fallot occurs in about five out of every 10,000 babies. With early diagnosis followed by appropriate treatment, the majority of children with tetralogy of Fallot live into adulthood.
