Results Color Doppler echocardiography showed that the embryocardia ductus arterious flow had a bright shunt from the pulmonary to descending aorta.

24%的胎心存在生理性三尖瓣返流,肺动脉阻力普遍较高,胎心动脉导管血流单向自肺动脉流向降主动脉,显色明亮。