Abstract：
OBJECTIVE: This study aimed to assess whether intrapartum ultrasound (ITU) measurements in maternal lateral posture are superimposable to ITU measurements in semi-recumbent position.
METHODS: A single-center, repeated measures design was used. Women in the second stage of labor were randomized to ITU first in semi-recumbent followed by ITU in side-lying posture without and with contraction, or inversely. The angle of progression (AOP) and the head-perineum distance (HPD) between contractions (AOP1 and HPD1) and with contraction (AOP2 and HPD2) were measured in each maternal posture. The differences between AOP1 and AOP2 (dAOP), and between HPD1 and HPD2 (dHPD) were calculated.
CONCLUSIONS: Forty-two women participated in the study. A generalized estimating equation model showed that AOP1 (-3.00°; 95 % CI -5.77 to -0.23; p = 0.03) and AOP2 (-4.14°; 95 % CI -7.20 to -1.08; p = 0.008) were lower in semi-recumbent compared to maternal lateral posture. HPD1 (+1.43 mm; 95 % CI 0.05-2.81; p = 0.042) and HPD2 (+1.53 mm; 95 % CI 0.17-2.89; p = 0.03) were higher in semi-recumbent position. Differences in the ITU measurements in maternal lateral posture compared to semi-recumbent position are small. Monitoring the second stage of labor with ITU in lateral maternal posture is possible.
METHODS: A single-center, repeated measures design was used. Women in the second stage of labor were randomized to ITU first in semi-recumbent followed by ITU in side-lying posture without and with contraction, or inversely. The angle of progression (AOP) and the head-perineum distance (HPD) between contractions (AOP1 and HPD1) and with contraction (AOP2 and HPD2) were measured in each maternal posture. The differences between AOP1 and AOP2 (dAOP), and between HPD1 and HPD2 (dHPD) were calculated.
CONCLUSIONS: Forty-two women participated in the study. A generalized estimating equation model showed that AOP1 (-3.00°; 95 % CI -5.77 to -0.23; p = 0.03) and AOP2 (-4.14°; 95 % CI -7.20 to -1.08; p = 0.008) were lower in semi-recumbent compared to maternal lateral posture. HPD1 (+1.43 mm; 95 % CI 0.05-2.81; p = 0.042) and HPD2 (+1.53 mm; 95 % CI 0.17-2.89; p = 0.03) were higher in semi-recumbent position. Differences in the ITU measurements in maternal lateral posture compared to semi-recumbent position are small. Monitoring the second stage of labor with ITU in lateral maternal posture is possible.
摘要：
目的：本研究旨在评估产妇侧卧位的产时超声（ITU）测量值是否与半卧位的ITU测量值重叠。
方法：单中心，采用重复措施设计。处于第二阶段的妇女被随机分配到ITU，首先是半卧位，然后是无收缩和有收缩的侧卧姿势，或相反。在每种母体姿势下测量收缩（AOP1和HPD1）与收缩（AOP2和HPD2）之间的发展角度（AOP）和头-会阴距离（HPD）。AOP1和AOP2（dAOP）之间的差异，并计算HPD1和HPD2之间(dHPD)。
结论：42名女性参与了这项研究。广义估计方程模型显示，半卧位的AOP1（-3.00°；95％CI-5.77至-0.23；p=0.03）和AOP2（-4.14°；95％CI-7.20至-1.08；p=0.008）低于产妇侧卧位。HPD1(+1.43mm;95%CI0.05-2.81;p=0.042)和HPD2(+1.53mm;95%CI0.17-2.89;p=0.03)在半卧位中更高。与半卧位相比，孕妇侧卧位的ITU测量值差异很小。可以用ITU以侧方产妇姿势监测第二产程。
方法：单中心，采用重复措施设计。处于第二阶段的妇女被随机分配到ITU，首先是半卧位，然后是无收缩和有收缩的侧卧姿势，或相反。在每种母体姿势下测量收缩（AOP1和HPD1）与收缩（AOP2和HPD2）之间的发展角度（AOP）和头-会阴距离（HPD）。AOP1和AOP2（dAOP）之间的差异，并计算HPD1和HPD2之间(dHPD)。
结论：42名女性参与了这项研究。广义估计方程模型显示，半卧位的AOP1（-3.00°；95％CI-5.77至-0.23；p=0.03）和AOP2（-4.14°；95％CI-7.20至-1.08；p=0.008）低于产妇侧卧位。HPD1(+1.43mm;95%CI0.05-2.81;p=0.042)和HPD2(+1.53mm;95%CI0.17-2.89;p=0.03)在半卧位中更高。与半卧位相比，孕妇侧卧位的ITU测量值差异很小。可以用ITU以侧方产妇姿势监测第二产程。
