Risk of Obstetric Anal Sphincter Injury with Fundal Pressure in Second
Stage of Labour; Transperineal Ultrasound Study
Abstract
Objective: The aim of this study was to evaluate the effect of using
uterine fundal pressure during the second stage of delivery on obstetric
anal sphincter injury (OASI), among primiparous women using
three-dimensional transperineal ultrasonography. Design: Case control
study Setting: Tertiary Urogynecology Unit Population: Nulliparous women
with term, singleton, cephalic presentation gestation delivered with
fundal pressure in second stage of labour. Main Outcome Measure:
Complete, incomplete IAS and EAS defect in transperineal tomographic
ultrasound imaging Method: A total of 73 women who had their first
vaginal birth were included in the study, 37 of them applied fundal
pressure and 36 of them delivered spontaneously without fundal pressure.
Tomographic ultrasound imaging with 3D transperineal assessment was
performed within 48 h of delivery, IAS and EAS defect were determined.
Results: Five (13.5%) women in the fundal pressure group, 7 (20%)
women in the control group had complete EAS (p = 0.4). Complete IAS was
observed in 1 (2.7%) women in the fundal pressure group and 2 (5.7%)
women in the control group (p = 0.5). Half-moon sign was observed in 1
woman in both groups (p = 0.9). The rate of other signs were similar in
both groups. Multivariate regression models revealed that none of, age,
episiotomy, length of second stage of labour, fundal pressure
application status and number were independent predictor of complete IAS
or EAS defect. Conclusions: Fundal pressure during the second stage of
delivery is not cause increase in rate of OASI detected with
ultrasonography.