Prognostic value of the occiput spine angle on ultrasound of pregnant women in full-term labor at Hai Phong Hospital of Obstetrics & Gynecology in 2021

Abstract

Cross-sectional descriptive study of 120 singleton pregnant women in full-term labor from January 17, 2021, to April 30, 2021, at Hai Phong Hospital of Obstetrics and Gynecology. In the study, the percentage of women giving vaginal delivery was 87.5% and the percentage of those having cesarean section was 12.5%. The cut-off point of the occiput spine angle (OSA) in predicting the probability of vaginal delivery was 125° with a sensitivity of 85.7% and specificity of 86.7%. The group having OSA ≥ 125° had a rate of vaginal delivery that was much higher than the group showing OSA < 125° with OR at 39. The vaginal delivery group with OSA ≥ 125° had a shorter time (minutes) to end-stage Ia and the labor (261.06 ± 23.75 and 401.28 ± 26.72 compared to 703.67 ± 98.87 and 906.33 ± 89.27) compared to the group having OSA < 125°. The women over 35 years old with OSA ≥ 125° had a rate of vaginal delivery that was 13 times higher than those with OSA < 125°. The pregnant women giving birth for the first time with OSA ≥ 125° had a rate of vaginal delivery that was 14 times higher than those having OSA < 125°. Conclusion: Measuring OSA on ultrasound is an objective tool to assess the degree of fetal head deflexion during labor and to predict the method of delivery. The Pregnant women with occiput–spine angle < 125° had a higher risk for cesarean section.