in the newborn the presence of a widely patent duclus arteriosus and its capacity to transmit the flow and pressure from a hypertensive pulmonary artery to the descending aorta and thus to the subclavian arteries prevents cerebral symptoms and angiographic signs , but in the older infant and child , the internal diameter of the ductus has usually decreased , leading to symptoms of the subclavian steal syndrome .
C0021289
newborn
C0008059
child