平卧位超声检查时长对晚孕胎儿脐动脉血流参数的影响

目的探讨平卧位超声检查时长对晚孕胎儿脐动脉血流参数的影响。方法350例进行超声检查晚孕胎儿脐动脉血流参数的晚孕孕妇,依据超声检查初的胎儿脐动脉收缩压与舒张压的比值(S/D)将孕妇分为初始正常组(212例)与初始异常组(138例)。分别比较初始正常组与初始异常组检查初及检查后的胎儿脐动脉血流参数,比较初始正常组与初始异常组检查初与检查后S/D值变化情况。结果350例孕妇超声检查时长为(13.44±1.89)min,超声检查初正常212例(60.57%),超声检查初异常138例(39.43%)。检查初,初始正常组S/D值(2.35±0.28)、阻力指数(RI)(0.51±0.04)、搏动指数(PI)(0.84±0.10)均低于本组检查后的(2.51±0.43)、(0.59±0.07)、(0.89±0.13),差异均有统计学意义(P<0.05)。检查初,初始异常组S/D值(3.08±0.59)、RI(0.67±0.04)、PI(1.07±0.14),均高于本组检查后的(2.94±0.49)、(0.65±0.06)、(1.02±0.17),差异均有统计学意义(P<0.05)。检查后,初始正常组S/D值升高至异常发生率低于初始异常组S/D值降低至正常发生率,差异有统计学意义(P<0.05)。两组检查初胎儿心率与本组检查后比较,差异无统计学意义(P>0.05)。结论采用平卧位超声检查时最好是在超声检查初就进行脐动脉血流参数的测试记录,对于超声检查初始S/D值存在异常的孕妇,可以在检查过程中多次重复测量以达到监测S/D值变化情况的目的。

Effect of duration of supine ultrasonography on umbilical artery blood flow parameters in late pregnancy

Objective To discuss the effect of duration of supine ultrasonography on umbilical artery blood flow parameters in late pregnancy.Methods A total of 350 cases of late pregnant women who underwent ultrasound examination of umbilical artery blood flow parameters were divided into the initial normal group(212 cases)and the initial abnormal group(138 cases)according to the ratio of systolic to diastolic pressure(S/D)of the fetal umbilical artery at the beginning of the ultrasound examination.The umbilical artery flow parameters at the beginning and after the examination were compared between the two groups,along with the changes in S/D values after the examination.Results The duration of ultrasound examination was(13.44±1.89)min in 350 pregnant women,212 cases(60.57%)were initially normal on ultrasound examination,and 138 cases(39.43%)were abnormal on ultrasound examination.At the beginning of the examination,the S/D value(2.35±0.28),resistance index(RI)(0.51±0.04)and pulsatility index(PI)(0.84±0.10)in the initial normal group were lower than(2.51±0.43),(0.59±0.07)and(0.89±0.13)in this group after the examination,and the differences were statistically significant(P<0.05).At the beginning of the examination,the S/D values(3.08±0.59),RI(0.67±0.04),and PI(1.07±0.14)of the initial abnormal group were higher than(2.94±0.49),(0.65±0.06),and(1.02±0.17)of this group after the examination,and the difference was statistically significant(P<0.05).After the examination,the incidence of increased S/D value exceeded the normal range of the initial normal group was lower than the incidence of S/D value decreased to the normal range of the initial abnormal group,and the difference was statistically significant(P<0.05).In the two groups,there was no statistically significant difference in fetal heart rate at the beginning and after the examination(P>0.05).Conclusion When using supine ultrasonography,it is better to test and record the parameters of umbilical artery blood flow at the beginning of ultrasonography.For pregnant women with abnormal initial S/D values in ultrasonography,the measurement can be repeated several times during the examination to achieve the purpose of monitoring the change of S/D.