Nomogram based on the final antepartum ultrasound features before delivery for predicting failed spontaneous vaginal delivery in nulliparous women

Ping Zhou; Han Chen; Yang Zhang; Min Yao

doi:10.3389/fsurg.2022.1048866

Nomogram based on the final antepartum ultrasound features before delivery for predicting failed spontaneous vaginal delivery in nulliparous women

Front Surg. 2023 Jan 6:9:1048866. doi: 10.3389/fsurg.2022.1048866. eCollection 2022.

Authors

Ping Zhou¹, Han Chen², Yang Zhang², Min Yao³

Affiliations

¹ Department of Gynecology, Wuhan Children's Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China.
² Department of Ultrasound, Wuhan Children's Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China.
³ Department of Pediatrics, , Wuhan Children's Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China.

Abstract

Background: Accurate identification of nulliparous women with failed spontaneous vaginal delivery (SVD) is crucial to minimize the hazards associated with obstetrical intervention (OI). While abnormal labor progression can be identified with intrapartum ultrasonography, labor-related complications may be unavoidable due to the limited time window left to the obstetrician. Antepartum ultrasound enables sufficient obstetric planning. However, there is typically a longer gap between ultrasound assessment and delivery that often lowers the prediction accuracy compared to intrapartum ultrasonography.

Objective: In this study, antepartum ultrasound assessment was included to each fetal ultrasound examination after 36 weeks of gestation until the onset of labor. We aim to establish a nomogram to predict the likelihood of failed SVD in nulliparous women using the last antepartum ultrasound findings before labor beginning.

Methods: Of the 2,143 nulliparous women recruited, 1,373 were included in a training cohort and 770 in a validation cohort, based on their delivery date. Maternal and perinatal characteristics, as well as perinatal ultrasound parameters were collected. In the training cohort, the screened correlates of SVD failure were used to develop a nomogram for determining whether a nulliparous woman would experience SVD failure. This model was validated in both training and validation cohorts.

Results: SVD failure affected 217 nulliparous women (10.13%). In the training cohort, SVD failure was independently associated with BMI [odds ratio (OR) = 1.636], FHC (OR = 1.194), CL (OR = 1.398), and PCA (OR = 0.824) (all P < 0.05). They constituted a nomogram to estimate the individual risk of SVD failure. The model obtained clinical net benefits in both the training and validation cohorts and was validated to present strong discrimination and calibration.

Conclusion: The developed nomogram based on the last antepartum ultrasound findings may be helpful in avoiding OI and its related complications by assessing the likelihood of a failed SVD in nulliparous women.

Keywords: abnormal labor progression; antepartum ultrasound; nomogram; nulliparous women; spontaneous vaginal delivery.