Ultrasonographic Change in Uterocervical Angle is not a Risk Factor for Preterm Birth in Women with a Short Cervix


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Abstract

ObjectiveTo 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 DesignA 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.ResultsA 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).ConclusionA 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.

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