The search on the increasing rate of pitch of screws of nuchal circular umbilical cord and fetal intrauterine anoxia by Three-dimension colour Doppler ultrasonography

Objective:To evaluate the relation between the increased ratio of pitch of screws of nuchal circular umbilical cord and fetal intrauterine anoxia by detected the increased ratio of pitch of screws of nuchal circular umbilical cord with Three-dimension dolour Doppler ultrasonography.Methods:115 fetuses with nuchal circular umbilical cord were examined the pitch of screws of nuchal circular umbilical cord and dissociated umbilical cord,the increased ratio between them were calculated.All fetuses were divided into anoxia group(42 cases) and non-anoxia group(73 cases) according to NST Score.The fetuses were tested by non stress test(NST) in order to observe the amniotic fluid and the fetal heart rate in the course of parturition after post partum.Results:The increased ratio of anoxia group [(0.37±0.07)%] was much more than the non-anoxia group [(0.20±0.01)%](P0.01).There also were significant differences in umbilical artery blood flow parameter S/D [anoxia group was(3.23±0.08),non-anoxia group was(2.27±0.11)],abnormal fetal heart rate and amniotic fluid [anoxia group had 23 cases(54.8%),non-anoxia group had 13 cases(17.8%)] between the two groups(all P0.05).Conclusion:The increasing ratio of pitch of screws of nuchal circular umbilical cord detected by Three-dimension colour Doppler ultrasonography can imply fetal intrauterine anoxia in time,and can provide help for clinical early diagnosis and timely treatment.