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Right-to-left shunt across the patent ductus arteriosus (PDA). (A) Short axis view; color Doppler flow pattern is blue during systole and diastole, (B) flow across the PDA is below the baseline during systole, and (C) flow across the PDA is below the baseline during systole and diastole in the case of “pure right-to-left shunt.” MPA, main pulmonary artery; RPA, right pulmonary artery; LPA, left pulmonary artery.
