Subpubic Arch Angle and Mode of Delivery in Low-Risk Nulliparous Women.

Abstract:

OBJECTIVE:To assess whether subpubic arch angle (SPA) measurement before labor onset can predict labor outcome among low-risk pregnant women. METHODS:3D ultrasound volume was transperineally acquired from a series of nulliparous women with uncomplicated pregnancy at term before the onset of labor. SPA was measured offline using Oblique View Extended Imaging (OVIX) on each volume performed by an investigator not involved in the clinical management. Labor outcome was prospectively investigated in the whole study group. RESULTS:Overall, 145 women were enrolled in the study. Of these, 83 underwent spontaneous vaginal delivery, whereas obstetric intervention was performed in 62 cases (Cesarean section in 40 and vacuum extraction in 22). The SPA appeared to be significantly narrower in the women submitted to obstetric intervention compared with those undergoing spontaneous vaginal delivery (116.8 ± 10.3° vs. 123.7 ± 9.6°, p < 0.01). At multivariate analysis SPA and maternal age were identified as independent predictors of the mode of delivery. On the other hand, the duration of labor did not show a significant relationship with SPA. CONCLUSIONS:In low-risk nulliparous women at term gestation, SPA measurement obtained by 3D ultrasound before the onset of labor seems to predict the likelihood of an obstetric intervention but not the duration of labor.

journal_name

Fetal Diagn Ther

authors

Youssef A,Ghi T,Martelli F,Montaguti E,Salsi G,Bellussi F,Pilu G,Rizzo N

doi

10.1159/000441517

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

150-5

issue

2

eissn

1015-3837

issn

1421-9964

pii

000441517

journal_volume

40

pub_type

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