孕晚期NST可疑型胎儿的长程胎心监护特点分析

Analysis of the characteristics of long-term fetal heart rate monitoring of NST suspicious type fetuses in the third trimester of pregnancy

目的分析孕晚期无应激试验(NST)可疑型胎儿的长程胎心监护特点。方法选择2019年2月至2021年12月在汉中市中心医院建档的120例产妇作为研究对象。按照孕晚期NST的检测结果,将所有产妇分为研究组50例(NST可疑型)和对照组70例(NST反应型)。比较两组产妇的妊娠结局、胎心率基线、胎心率基线变异率、平均单位时间加速面积和心加速的时长比例。结果两组产妇的终止妊娠方式、终止妊娠天数、新生儿窒息率比较差异均无统计学意义(P>0.05);两组产妇的胎心监护有效时长、总时长比较差异均无统计学意义(P>0.05);研究组产妇的胎心率基线、轻度变异率、中等变异率分别为(138.09±5.67)次/min、51.18%、56.58%,明显多(高)于对照组的(135.09±5.40)次/min、40.79%、46.73%,差异均有统计学意义(P<0.05);研究组产妇的基线变异值为(5.18±1.09)次/min,明显小于对照组的(6.29±1.16)次/min,差异有统计学意义(P<0.05);两组产妇的显著变异率比较差异无统计学意义(P>0.05);研究组产妇的胎心加速时长比例的最大值与最小值分别为(29.63±5.62)%、(47.78±9.04)%,明显低于对照组的(32.85±7.91)%、(54.96±11.95)%,单位时间加速面积的最小值和最大值分别为(0.75±0.28)%、(2.76±0.63)%,明显低于对照组的(1.15±0.42)%、(4.91±1.05)%,差异均有统计学意义(P<0.05);研究组产妇的平均胎心加速时长比例和平均单位时间加速面积分别为(37.43±4.58)%、(1.41±0.47)cm^(2)/20 min,明显低于对照组(40.79±4.85)%、(2.05±0.68)cm^(2)/20 min,差异均有统计学意义(P<0.05)。结论孕晚期NST可疑型胎儿的长程胎心监护的特征为胎心率基线、轻度变异率、中等变异率均增加;基线变异值降低、轻度变异率增加和单位时间加速面积减少。

Objective To investigate and analyze the characteristics of long-term fetal heart rate monitoring of non-stress test(NST)suspicious type fetus in the third trimester.Methods We selected 120 pregnant women who were filed in Hanzhong Central Hospital from February 2019 to December 2021 as the study subjects.According to the test re-sults of NST in the third trimester of pregnancy,the pregnant women were divided into the study group of 50 cases(NST suspicious type)and the control group of 70 cases(NST reactive type).The pregnancy outcome,fetal heart rate baseline,fetal heart rate baseline variability,average area of acceleration per unit time,and the proportion of cardiac acceleration time were compared between the two groups.Results There was no statistically significant difference in pregnancy ter-mination mode,pregnancy termination days,and neonatal asphyxia rate between the two groups(P>0.05).There were no statistically significant in effective duration and total duration of fetal heart rate monitoring between the two groups(P>0.05).The baseline,mild variability,and moderate variability of fetal heart rate in the study group were(138.09±5.67)beats/min,51.18%,and 56.58%,which were significantly higher than(135.09±5.40)beats/min,40.79%,and 46.73%in the control group(P<0.05).The baseline variation of pregnant women in the study group was(5.18±1.09)times/min,which was significantly lower than(6.29±1.16)times/min in the control group(P<0.05).Comparison of significant variation rates showed no statistically significant difference between the two groups(P>0.05).The maximum and minimum values of the proportion of fetal heart acceleration duration in the study group were(29.63±5.62)%and(47.78±9.04)%,which were significantly lower than(32.85±7.91)%and(54.96±11.95)%in the control group,and the minimum and maximum values of the accelera-tion area per unit time were(0.75±0.28)%and(2.76±0.63)%,which were significantly lower than(1.15±0.42)%and(4.91±1.05)%in the control group(P<0.05).The average rate of fetal heart rate acceleration time and the average accel-eration area per unit time in the study group were(37.43±4.58)%and(1.41±0.47)cm^(2)/20 min,which were significantly lower than(40.79±4.85)%and(2.05±0.68)cm^(2)/20 min in the control group(P<0.05).Conclusion The characteristics of long-term fetal heart rate monitoring of NST suspicious type fetuses in the third trimester include increased baseline,mild and moderate variability of fetal heart rate,decreased baseline variation value,increased mild variation rate,and de-creased accelerated area per unit time.