未闭动脉导管位于左锁骨下动脉远侧的降主动脉峡部与左肺动脉根部之间，粗细长短不等，大多外径10mm左右，长约6～10mm。外形可呈管状、漏斗状，粗短者则呈窗状。动脉导管未闭是最常见的先天性心脏病之一。先天性心血管病中居第二位。由于主动脉和肺动脉的压力相差悬殊，动脉导管未闭引起连续性的左向右分流，致肺循环及回流至左心房的血流量增加，左、右室负荷均加重。
经未闭动脉导管造影可显示左、右肺动脉连接处隔膜状狭窄。
It could show the membranous stenosis at the junction of left and right pulmonary artery by angiography through the patent ductus arteriosus.
在体外循环下闭合未闭动脉导管是一种安全性高、手术效果好的方法。
Closure PDA under extracorporeal circulation proved a good operative method with considerable high safety and fine results.
结论简易超声心动图指标可较好地预测未闭动脉导管自行闭合的可能性，对患儿是否选择早期干预措施具有指导价值。
ConclusionSimple echocardiographic parameters are capable of prediction of spontaneous closure of PDA in neonates and infants, and may help to decide whether early intervention is necessary.
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