探讨血管前置的高危因素和产前超声诊断的价值。

回顾性分析2012年1月至2014年6月就诊于广东省妇幼保健院行产前超声检查和(或)临床诊断为妊娠合并血管前置患者的超声声像图资料，并追踪妊娠结局。

产前超声共检出血管前置18例，其中1例脐带先露误诊为血管前置；漏诊1例。确诊为血管前置病例共计18例，其中16例(88.9%，16/18)为单胎妊娠，2例(11.1%，2/18)为三胎妊娠；合并低置胎盘9例(50.0%，9/18)，帆状胎盘8例(44.4%，8/18)，副胎盘2例(11.1%，2/18)，球拍状胎盘2例(11.1%，2/18)，单脐动脉3例(16.8%，3/18)。18例胎儿中，早产9例(50.0%，9/18)，足月产8例(44.4%，8/18)，1例(5.6%，1/18)因胎儿结构异常引产。产前超声检查漏诊的1例患者，足月妊娠经阴道分娩时大出血，胎儿死亡。

胎盘异常是血管前置的高危因素，需重视产前超声检查，及时诊断和处理，可有效避免不良妊娠结局的发生。

To explore the risk factors and the value of ultrasound in prenatal diagnosis of vasa previa.

The ultrasound data of vasa previa pregnant patients, who were admitted to Guangdong Province Maternal and Child Health Hospital from January 2012 to June 2014, were retrospectively analyzed. The pregnancy outcomes were followed-up.

Eighteen vasa previa patients were antenatal diagnosed by ultrasound. One presentation of umbilical cord patient was misdiagnosed as vasa previa, and 1 case missed diagnosis. In the 18 vasa previa patients, 16 cases (88.9%, 16/18) were singleton pregnancy and 2 cases (11.1%, 2/18) were triplet pregnancy; 9 cases (50.0%, 9/18) were low-lying placenta, 8 cases (44.4%, 8/18) were velamentous placenta, 2 cases (11.1%, 2/18) were accessory placenta, 2 cases (11.1%, 2/18) were battledore placenta; and 3 cases (16.8%, 3/18) were single umbilical artery. There were totally 18 fetuses/newborns, 9 cases (50.0%, 9/18) were preterm birth, 8 cases (44.4%, 8/18) were full-term birth, and 1 case (5.6%, 1/18) underwent induced labor because of fetal malformation. For the missed diagnosis case, the patient occurred massive hemorrhage during vaginal delivery at full-term and the fetus died.

Placental abnormality is the risk factor of vasa previa. Emphasizing the prenatal ultrasound examination, diagnosing and managing timely, could avoid the occurrence of adverse pregnancy outcomes effectively for the vasa previa patients.