Which congenital heart defect often allows blood to flow from the right side of the heart to the left (right-to-left shunt) and causes clubbing of fingers in older children?
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Correct answer: Unrepaired TOF or other cyanotic lesions
Cyanotic lesions with right-to-left shunt allow deoxygenated blood into systemic circulation; chronic hypoxia causes clubbing and polycythaemia in older children.
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