[Ultrasonic color Doppler flow imaging detect coiling of the umbilical cord around fetal neck].

Twenty eight third trimester pregnant women that B mode ultrasound showed coiling of umbilical cord around fetal neck (UCAN) were monitored by Color Doppler Flow Imaging (CDFI) before delivery. UCAN were discovered in 12 women by CDFI, and all were confirmed at delivery. The accurate diagnosis rate was 100%. The accuracy rate of "no UCAN" diagnosed by CDFI was 93.75%. The accurate diagnosis rate of CDFI was significantly higher than that of the simple B mode ultrasound examination; and the misdiagnosis rate of "no UCAN" was 6. 25%, significantly lower than B mode (53.57%) (both P < 0.01). CDFI might influence the mode of delivery and the fetal prognosis. This study showed that CDFI can precisely detect whether there is UCAN or not before delivery. Meanwhile, the diagnosis standards of UCAN was established.