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Visualization of patent ductus arteriosus in long axis view (LAX). (A) 2D classical LAX, (B) LAX slightly tilted anteriorly toward the pulmonary artery, and (C) main pulmonary artery with pulmonary branches. RV, right ventricle; LV, left ventricle; AV, aortic valve; PV, pulmonary valve; MPA, main pulmonary artery; RPA, right pulmonary artery; LPA, left pulmonary artery.
