Can transvaginal cervical length and cervical strain elastography predict mid-trimester medical induction to abortion intervals?

Objective: Mid-trimester pregnancy terminations are becoming an increasingly common practice in obstetrics. Accurate prediction of delay from induction to abortion may help in planning the optimal time for the medical induction process and optimising the use of healthcare services. Therefore, we aimed to assess whether the transvaginal cervical length and cervical elastography can predict the time interval from medical induction to abortion in cases of medically indicated mid-trimester pregnancy termination.

Materials and methods: We performed a prospective observational pilot study between January 2022 and October 2022 in patients who have undergone medically indicated mid-trimester pregnancy termination with a non-dilated cervix for foetal morphological, chromosomal abnormalities or preterm premature rupture of membranes. Cervical length (CL) and cervical strain ratio (CSR) were measured by transvaginal sonography. The predictive value of CL and CSR on the induction to abortion interval was calculated after medical induction with misoprostol.

Results: Fifty-three eligible pregnant women were evaluated. The mean gestational age at abortion was 17.61 ± 2.81 weeks. The mean time interval from induction to abortion was 31.72 ± 16.57 h. In multivariate linear regression analysis, CL and the history of previous vaginal delivery were the significant independent predictors of the induction to abortion interval (all p < 0.01), with no additional significant contribution from CSR.

Conclusion: Transvaginal CSR is unlikely to be useful in the prediction of induction to abortion interval in the mid-trimester medically indicated termination of pregnancy.SHORT CONDENSATIONTransvaginal cervical length is the significant independent predictor of the induction to abortion interval in the mid-trimester medically indicated termination of pregnancy with no additional significant contribution from cervical strain ratio.