Objective To study relationship between fetal nuchal depth ( D)/ thickness of nuchal circular umbilical cord (T) (D/T) ratio in cord around neck detected by three-dimensional colour Doppler ultrasonography and fetal intrauterine anoxia. Methods 157 fetuses with cord around neck in 37th to 41 +6 th weeks of gestation were selected, D/T ratio and umbilical artery blood flow parameter S/D were calculated, and nonstress test (NST) was conducted. Anniotic fluid volume of the pregnant woman and fetal heart rate in course of parturition were monitored. The fetuses were divided into anoxia group and non-anoxia group according to their NST scores. Results D/T ratio in the anoxia group ( 0.73 ± 0.09) was much more than the non-anoxia group (0.46 ± 0. 17 ) ( u = 13.00, P ＜ 0.05 ). There also were significant differences in cord artery blood flow parameter S/D, abnormal fetal heart rate and amniotic fluid contamination between the two groups (both P ＜ 0. 05 ). Conclusion D/T ratio in cord around neck measured by three-dimension colour Doppler ultrasonography can suggest fetal intrauterine anoxia in time, which may provide some helps for clinicians for early diagnosis and timely treatment.%目的 应用三维彩色多普勒检测胎儿脐带绕颈对颈部背侧皮肤产生压迹(D)及该切面脐带厚度(T),探讨其比值与胎儿宫内缺氧的关系.方法 选择孕37～41+6周脐带绕颈胎儿157例,测量D/T值、脐动脉收缩期血流速度与舒张期血流速度比值,行无应激试验胎儿监护,产后追踪羊水、产程中的胎心率.结果 缺氧组D/T为0.73±0.09,非缺氧组D/T为0.46±0.17,两者比较有显著性差异(u=13.00,P<0.05);两组脐动脉收缩期血流速度与舒张期血流速度比值、羊水污染及胎心率异常率比较亦均有显著性差异(u=17.54、χ2=43.84,均P<0.05).结论 三维彩色多普勒超声检测脐带绕颈D/T比值可及时提示胎儿宫内缺氧情况,为临床及早诊断和治疗提供帮助.
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