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Uterine Cervical Change at Term Examined Using Ultrasound Elastography: A Longitudinal Study

 Hyun Soo Park  ;  Hayan Kwon  ;  Ja-Young Kwon  ;  Yun Ji Jung  ;  Hyun-Joo Seol  ;  Won Joon Seong  ;  Hyun Mi Kim  ;  Han-Sung Hwang  ;  Ji-Hee Sung  ;  Soo-Young Oh 
 JOURNAL OF CLINICAL MEDICINE, Vol.10(1) : 75, 2020-12 
Journal Title
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elastography ; parturition ; term pregnancy ; ultrasonography ; uterine cervix
The aim of the study was to investigate if there are changes in elastographic parameters in the cervix at term around the time of delivery and if there are differences in the parameters between women with spontaneous labor and those without labor (labor induction). Nulliparous women at 36 weeks of gestation eligible for vaginal delivery were enrolled. Cervical elastography was performed and cervical length were measured using the E-CervixTM system (WS80A Ultrasound System, Samsung Medison, Seoul, Korea) at each weekly antenatal visit until admission for spontaneous labor or labor induction. E-Cervix parameters of interest included elasticity contrast index (ECI), internal os strain mean level (IOS), external os strain mean level (EOS), IOS/EOS strain mean ratio, strain mean level, and hardness ratio. Regression analysis was performed using days from elastographic measurement at each visit to admission for delivery and the presence or absence of labor against cervical length, and each E-Cervix parameter fitted to a linear model for longitudinal data measured repeatedly. A total of 96 women were included in the analysis, (spontaneous labor, n = 39; labor induction, n = 57). Baseline characteristics were not different between the two groups except for cesarean delivery rate. Cervical length decreased with advancing gestation and was different between the two groups. Most elastographic parameters including ECI, IOS, EOS, strain mean, and hardness ratio were significantly different between the two groups. In addition, ECI, IOS, and strain mean values significantly increased with advancing gestation. Our longitudinal study using ultrasound elastography indicated that E-cervix parameters tended to change linearly at term near the time of admission for delivery and that there were differences in E-Cervix parameters according to the presence or absence of labor.
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1. College of Medicine (의과대학) > Dept. of Obstetrics and Gynecology (산부인과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Ja Young(권자영) ORCID logo https://orcid.org/0000-0003-3009-6325
Kwon, Ha Yan(권하얀)
Jung, Yun Ji(정윤지) ORCID logo https://orcid.org/0000-0001-6615-6401
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