Impact of body mass index on sonographic measurement of head perineum distance before operative vaginal delivery.

Objective: To evaluate the impact of body mass index (BMI) on sonographic measurement of head perineum distance (HPD) before operative vaginal delivery (OVD).

Methods: This was a single-center retrospective cohort study (Lille, France) conducted from March 1, 2019 to October 31, 2020 including all singleton and OVD. HPD measurement was systematically performed without and with compression on the perineum soft tissues.

Is sonographic measurement of head-perineum distance useful to predict obstetrical anal sphincter injury in case of vacuum delivery?

Objective: Determine if head-perineum distance (HPD) measurement before vacuum extraction (VE) was predictive of an obstetric anal sphincter injury (OASIS) occurrence.

Methods: Retrospective, bicentric (Lille and Poissy, France) cohort study conducted from January 2019 to June 2020. All VE in singleton pregnancies of ≥34 weeks were included.

Ultrasound assessment of fetal head position and station before operative delivery: Can it predict difficulty?

Objective: To evaluate whether ultrasound assessment of fetal head position and station though head perineum distance (HPD), is more predictive of a difficult operative vaginal delivery (OVD) than digital examination.

Methods: Retrospective, monocentric case control study including all singleton OVD at ≥34 weeks gestation. The principal criteria for a difficult OVD were based on a composite criterion of: an OVD considered "difficult" by the birth attendant, and/or two vacuum device detachments if a vacuum was used, and/or change of instrument, and/or a cesarean delivery for OVD failure.