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目的 探讨胎儿主动脉瓣二瓣化畸形超声心动图特征.方法 回顾性分析12例经产后证实的主动脉瓣二瓣化畸形胎儿超声心动图资料.结果 12例主动脉瓣二瓣化畸形胎儿,8例产前明确诊断,3例产前有阳性超声表现提示,1例漏诊.主动脉瓣二瓣化畸形胎儿超声心动图特征性表现:(1)升主动脉增宽(9例,75％);(2)左室流出道切面主动脉瓣开放不贴壁(8例,67％);(3)心底大动脉短轴切面主动脉瓣显示2个瓣(8例,67％).4例合并主动脉瓣狭窄,3例产前明确诊断,瓣口峰值流速≥1.4 m/s,1例产前未提示;另有3例产前考虑合并主动脉瓣狭窄,产后证实不合并狭窄,瓣口峰值流速均＜1.4 m/s.结论 升主动脉增宽为胎儿主动脉瓣二瓣化畸形超声心动图中最敏感征象,左室流出道切面主动脉瓣开放不贴壁为第二间接征象,心底大动脉短轴切面清晰显示主动脉瓣2个瓣是其确诊指征.产前瓣口峰值流速≥1.4m/s,为诊断是否合并狭窄的敏感指征.“,”Objective To explore the characteristics of ultrasound imaging in fetuses with Bicuspid Aortic Valve (BAV).Methods The data of echocardiography in 12 fetuses with BAV were analysed retrospectively.12 cases of BAV without other cardiovascular malformations were confirmed by echocardiogram after delivery.Results In 12 cases of BAV,8 cases were diagnosed by prenatal echocardiogram,3 cases presented abnormal ultrasound imaging in fetal echocardiogram,1 case was missed.The characteristics of ultrasound imaging included ascending aortic dilatation(9cases of 12,75 ％),aortic valve opening without adherence in left ventricular outflow tract view(8 cases of 12,67 ％),and two valve cusps in short axis section of the great arteries(8 cases of 12,67 ％).In 4 cases of BAV with stenosis,3 cases were diagnosed clearly by prenatal echocardiogram,the aortic valve peak velocity prenatally were grater than 1.4 m/s in all these 3 cases,1 case was missed.In addition,3 cases of BAV diagnosed with stenosis prenatally were confirmed without stenosis by echocardiogram after delivery,the aortic valve peak velocity prenatally were less than 1.4 m/s in all these 3 cases.Conclusions Ascending aortic dilatation in fetal echocardiogram was the first sensitive characteristic for the diagnosis of fetal BAV,aortic valve opening without adherence in left ventricular outflow tract view was the second.The direct sign for the diagnosis of fetal BAV was two valve cusps displayed in short axis section of the great arteries.The aortic valve peak velocity prenatally grater than 1.4 m/s was the sensitive indication for the diagnosis of fetal BAV with stenosis.