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Mitral stenosis and rupture of the bronchial veins can produce hemoptysis. Cyanosis. Differential Cyanosis = Cyanosis noted only in the LE due to an R to L shunt through a PDA (patent ductus arteriosus). The shunt results from pulmonary hypertension. Blood crosses the PDA below the level of the carotid and L subclavian arteries. ................
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