Abstract：Objective: To explore the factors that affect evaluation of normal placental elasticity by shear wave elastography(SWE) technology. Methods: Sixty-nine normal single pregnant women in the second or third trimester were enrolled in the study. The hemodynamic parameters(S/D, PI, RI) of bilateral uterine artery and umbilical artery were routinely measured by ultrasound. The elastic modulus of placenta from the central-fetal surface, central-maternal surface, peripheral-fetal surface and peripheral-maternal surface were measured by SWE technology. The 5-minute Apgar score were gained after birth. The relationship of elastic modulus and sampling areas, gestational weeks and the above hemodynamic parameters was evaluated. Results: The central-fetal surface, the central-maternal surface, the peripheral-fetal surface and the peripheral-maternal surface of normal pregnancy placental elastic modulus in the second or third trimester were (5.85±1.68) kPa, (6.20±1.29) kPa, (5.88±1.30) kPa, (6.24±1.23) kPa, respectively. There was no statistical difference of elastic modulus among the four different areas of the placenta(P>0.05). The placental elastic modulus in the second trimester and the third trimester were (5.79±0.67) kPa and (6.17±0.88) kPa, respectively. There was no significant difference of elastic modulus between the second and third trimester. There was no obvious correlation between placental elastic modulus and hemodynamic parameters of bilateral uterine artery and umbilical artery(P>0.05). Conclusion: The normal placental elastic modulus value in the second or third trimester is (6.04±0.83) kPa, which is not significantly correlated with the sampling area, the gestational week and hemodynamic parameters. SWE technology can reliably obtain the elastic biomechanical information of placental tissue, which is helpful for more comprehensive assessment of placental function.
葛成霞，郭建锋. 正常中晚孕胎盘弹性模量评价及影响因素初探[J]. 中国临床医学影像杂志, 2019, 30(10): 726-729.
GE Cheng-xia, GUO Jian-feng. Evaluation of the placental elastic modulus in the normal second or third trimester of pregnancy and its influencing factors. JOURNAL OF CHINA MEDICAL IMAGING, 2019, 30(10): 726-729.
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