Factors related to morbidity and maternal and perinatal outcomes of umbilical cord torsion.

Objective: This study analyzed factors influencing umbilical cord torsion, measured the umbilical coiling index (UCI) postnatally, and analyzed the association of umbilical cord torsion with maternal and perinatal outcomes.

Methods: In total, 845 antenatal women who went into labor at the Fujian Provincial Maternity and Children’s Hospital from January 2016 to January 2017 were retrospectively studied. The patients were divided into those with and without umbilical cord torsion. Possible influencing factors and the UCI were noted, and maternal and perinatal outcomes were compared.

Results: Higher morbidity in the presence of umbilical cord torsion was affected by multiparous pregnancy and a long cord. The area under the curve was 0.666 for the UCI to predict fetal distress and 0.505 for the umbilical artery peak systolic to end diastolic flow velocity ratio (S/D ratio) to predict fetal distress. Umbilical cord torsion was associated with higher rates of fetal distress, forceps-assisted delivery, cesarean sections, fetal heart rate abnormalities, amniotic fluid meconium staining, neonatal intensive care unit admission, and small for gestational age.

Conclusions: Multiparous status and longer umbilical cord length were highly associated with umbilical cord torsion. The UCI is a better predictor of fetal distress than is the umbilical artery S/D ratio.