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congenital patent ductus arteriosus

Ductus arteriosus was originally a normal blood flow channel between pulmonary artery and aorta in fetus. Because the lungs do not have respiratory function at this time, the pulmonary artery blood from the right ventricle enters the descending aorta through the catheter, while the blood from the left ventricle enters the ascending aorta, so the arterial catheter is necessary for the special circulation mode in embryonic period. After birth, the lungs swell and bear...

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