Ultrasound criteria for estimating the duration of spontaneous vaginal deliveries


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Objective. To determine the ultrasound indices reflecting the course of normal delivery. Subjects and methods. The investigation enrolled 120 patients with full-term singleton pregnancy. All the vaginal deliveries were uncomplicated. Ultrasound examination estimated the angle of progression (AoP), head progression distance (PD), head-symphysis distance (HSD), and head-perineum distance (HPD) in the latent and active phases of the first and second stages of labor. Results. In the latent phase of the first labor stage, AoP was 98.8° with a 24.2% increase by the beginning of the second stage of labor. PD was 1.67 cm with a 110.8% increase in the second stage; HSD was 5.6 cm, with a 35.9% reduction in the second period; HPD was 4.25 cm, with a 46.6% decrease. In active labor stage, there was a slight positive correlation between the time to the end of delivery and HPD (r = 0.298; p = 0.046). In the second labor stage, there was a moderate positive correlation between the time to the end of delivery and HPD (r = 0.400; p = 0.043) and a negative one between the former and PD (r = -0.514; p = 0.021). Conclusion. AoP, PD, HPD, and HSD, which are estimated in the first stage of labor, are not informative for predicting its duration. In the second stage of labor, PD and HPD show a signif icant relationship to the duration of labor, which allows them to be used for assessment of the course of delivery.

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作者简介

Andrey Prikhodko

Academician V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation

Email: a_prikhodko@oparina4.ru
PhD, physician of the maternity department

Andrey Romanov

Academician V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation

Email: romanov1553@yandex.ru
clinical resident

Oleg Baev

Academician V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation; I.M. Sechenov First Moscow State Medical University, Ministry of Health of the Russian Federation

Email: o_baev@oparina4.ru
MD, Professor, Head of Maternity Department; professor of the Department of Obstetrics, Gynecology, Perinatology, and Reproductology

参考

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