To find out the correlation of fetal head and neck abnormality to chromosome disease through ultrasound screening survey.

通过超声筛查胎儿头颈部异常以找出其与染色体病的相关性。

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Objective:To study the value of umbilical blood stream examination and descending test of fetal head on antenatal diagnosis of cord around neck and perinatal prognosis.

目的：探讨胎儿脐血流检测及胎头下降试验对脐带绕颈的诊断及预测其胎儿预后的价值。

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Results:The incidence of cephalic presentation dystocia was 17.91%, among which abnormality direction of fetal head was the major cause of dystocia and the incidence was 76.84%.

结果：头位难产的发生率为17.91%，其中胎头方位异常占头位难产总数的76.84%，是发生难产的主要原因。

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At the Cleveland Clinic, doctors perform 50% fewer invasive procedures, thanks to the testing advances, said Jeff Chapa, section head of obstetrics and maternal-fetal medicine.

WSJ: New Questions on Cutting-Edge Prenatal Tests