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目的分析胎儿脐带绕颈(UCAN)的声像图特征,提高超声诊断率,降低误诊和漏诊率。方法受检孕妇取仰卧位,先用二维超声行产科常规超声检查,观察胎儿、羊水、胎盘、脐带等情况,然后进行彩色多谱勒检测,测定位于颈部附近脐动脉的阻力指数(RI),收缩期最大血流速度与舒张期末血流速度比值(S/D)。结果脐带绕颈胎儿脐动脉RI为(0.58±0.12),S/D值为(2.37±0.43),均高于无脐带绕颈胎儿的RI值(0.53±0.11)和S/D比值(2.14±0.21)。结论彩色多谱勒对UCAN的发现具有十分重要的价值,尤其是对二维超声检查疑有UCAN的孕妇,均应建议行此检查。
Objective To analyze the features of fetal umbilical cord around the neck (UCAN), improve the diagnostic rate of ultrasound, and reduce the misdiagnosis and missed diagnosis rate. Methods Pregnant women under test were placed in supine position. Obstetric routine ultrasound examination was performed with two-dimensional ultrasound to observe fetus, amniotic fluid, placenta, umbilical cord and so on. Then color Doppler was used to measure the resistance index (RI) of umbilical artery ), Systolic maximum flow velocity and end diastolic flow velocity ratio (S / D). Results The RI of the umbilical artery around the neck was (0.58 ± 0.12) and the S / D was (2.37 ± 0.43), both of which were higher than those of the umbilical cord around the neck (0.53 ± 0.11) and the S / D ratio 0.21). Conclusions Color Doppler is of great value to the discovery of UCAN, especially for pregnant women suspected of having UCAN by two-dimensional ultrasonography.