Prediction of Successful outcome of Labor Induction at Term by Transvaginal Sonographic Assessment of Cervical Length

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Narissara Sanpanitchakit
Prisana Panichkul


Objectives: To examine transvaginal sonography assessment of cervical length (TVSCL) as a predictor of active phase of labor, successful vaginal delivery after labor induction, and to estimate the most useful cutoff point for cervical length (CL).

Materials and Methods: A prospective cohort study was conducted in the Obstetrics and Gynecology Department of Phramongkutklao Hospital. Pre-induction cervical assessment was undertaken in 120 women with singleton pregnancy at 37–42 weeks of gestation who underwent induction of labor. All women were measured for CL using transvaginal sonography followed by pelvic examination for Bishop score (BS) assessment.

Results: Successful induction of labor to active phase within 24 hours occurred in 84.1% of the subjects. The best cut-off point of CL for the prediction of successful labor induction to active phase within 24 hours was found to be 3.14 cm or less with a sensitivity of 73.3 %, a specificity of 78.9 %, as well as negative and positive predictive values of 35.7% and 94.9%, respectively. In addition, a 3.14 cm or less cut off point of CL can be used to predict successful vaginal delivery with a

Conclusion: TVSCL was significantly associated with successful induction of labor to active phase within 24 hours and can be used as a predictor for successful induction to vaginal delivery with a 3.14 cm or less cutoff point of CL.


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