Recurrence risk and risk factors for monozygotic twin and triplet birth in over 65,000 single-embryo transfers.

Purpose: To determine the recurrence risk and risk factors for monozygotic splitting after elective single-embryo transfers (eSET).

Methods: A retrospective cohort study was performed investigating 65,664 eSET cycles that resulted in a clinical pregnancy as reported in the Society for Assisted Reproductive Technology (SART) Clinical Outcomes Reporting System (CORS) between 2004 and 2017. Monozygosity was defined as more than one fetal heart tone by the first-trimester ultrasound and concordant sex at live birth.

Electronic Fetal Monitoring and Neonatal Outcomes when a Nuchal Cord Is Present at Delivery.

Objective: This study aimed to determine the association between nuchal cord, electronic fetal monitoring parameters, and adverse neonatal outcomes.

Study Design: This was a prospective cohort study of 8,580 singleton pregnancies. Electronic fetal monitoring was interpreted, and patients with a nuchal cord at delivery were compared with those without.

True knot at the time of delivery: electronic fetal monitoring characteristics and neonatal outcomes.

Objective: Determine the association between electronic fetal monitoring and neonatal outcomes in the setting of a true knot at delivery.

Study Design: This was a planned secondary analysis of a prospective cohort of 8580 women. Patients with and without a true knot were compared and the primary outcome was repetitive late decelerations occurring with at least 50% of contractions.