动脉导管是肺动脉和主动脉之间的交通血管,为胎儿循环的重要组成部分~([1]),通常在新生儿出生后48h内关闭,而早产儿动脉导管常延迟关闭,保持持续开放状态,称早产儿动脉导管未闭(patent ductus arteriosus,PDA)。PDA患儿如经动脉导管左向右分流量大时易致循环血流动力学变化,出现相应临床表现,如心脏杂音、心动过速、呼吸增快、脉压增大、低血压、水冲脉、心脏扩大,通常称之为具有血流动力学意义的PDA(hemodynamically significant The ductus arteriosus, a traffic artery between the pulmonary artery and the aorta, is an important part of the fetal circulation. [1] It is usually closed within 48 hours of birth, while the ductus arteriosus of premature infants is often closed for a prolonged period of time , Said premature infants with patent ductus arteriosus (PDA). PDA in children with transcatheter left bypass flow through the large easily lead to circulatory hemodynamic changes, the corresponding clinical manifestations, such as heart murmur, tachycardia, rapid breathing, increased pulse pressure, hypotension, water red Veins, heart enlargement, commonly referred to as hemodynamically significant PDA (hemodynamically significant