Ultrasonographic Change in Uterocervical Angle is not a Risk Factor for Preterm Birth in Women with a Short Cervix
27 April 2017
28 April 2017
05 June 2017 (eFirst)
Objective To determine if change in uterocervical angle (UCA) is associated with an increased rate of preterm birth (less than 37 weeks) for women with a short cervix.
Study Design A retrospective study was performed from January 2013 to March 2016 of singleton pregnancies undergoing universal cervical length screening. The difference between the UCA for the first cervical length ≤ 2.5 cm and last recorded cervical length < 25 weeks was defined as the change in UCA. The primary outcome was the rate of preterm birth at < 37 weeks of gestation.
Results A total of 176 women met the inclusion criteria. There was no difference in the rate of preterm birth at < 34 weeks (23.3 vs. 16.7%, p = 0.27) or at < 37 weeks (34.9 vs. 37.8%, p = 0.69) based on a change in UCA (i.e., decreased/no change or increased UCA). However, women with a final UCA ≥105 degrees had an increased risk of preterm birth at less than 34 weeks (24.2 vs. 6.8%, p = 0.01).
Conclusion A change in UCA was not associated with an increased risk of preterm birth. Instead, a final absolute UCA ≥ 105 degrees measured < 25 weeks was associated with an increased risk of preterm birth at < 34 weeks of gestation for women with a short cervix ≤ 2.5 cm.
These findings were presented at the 37th Annual Pregnancy Meeting, Society for Maternal Fetal Medicine, Las Vegas, NV, from January 23 to 28, 2017.