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Prospective evaluation of the uterocervical angle as a predictor of spontaneous preterm birth.

Authors
  • Farràs Llobet, Alba1, 2, 3
  • Higueras, Teresa1, 2, 3
  • Calero, Inés Z1, 2, 3
  • Regincós Martí, Laia2
  • Maiz, Nerea1, 2, 3
  • Goya, María M1, 2, 3
  • Carreras, Elena1, 2, 3
  • 1 Maternal and Fetal Medicine Group, Vall d'Hebron Institut de Recerca (VHIR), Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain. , (Spain)
  • 2 Maternal and Fetal Medicine Unit, Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain. , (Spain)
  • 3 Universitat Autònoma de Barcelona, Bellaterra, Spain. , (Spain)
Type
Published Article
Journal
Acta Obstetricia Et Gynecologica Scandinavica
Publisher
Wiley (Blackwell Publishing)
Publication Date
Nov 01, 2020
Volume
99
Issue
11
Pages
1511–1518
Identifiers
DOI: 10.1111/aogs.13879
PMID: 32311754
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The uterocervical angle has been proposed as an ultrasound marker to predict spontaneous preterm birth; however, the studies that provided this evidence were retrospective and their results heterogeneous. This study aimed to assess the ability of the uterocervical angle to predict spontaneous preterm birth before 34 and 37 weeks of gestation. A prospective cohort study with singleton pregnancies between 19.0 and 22.6 weeks of gestation. Uterocervical angle and cervical length were measured by transvaginal ultrasound. Maternal history and pregnancy data were recorded. Delivery data were subsequently collected. The final analysis included 1453 singleton pregnancies. Spontaneous preterm birth before 37 weeks occurred in 52 cases (3.6%) and before 34 weeks in 17 (1.2%). For the prediction of spontaneous preterm birth before 34 weeks, the area under the curve for the uterocervical angle was 0.67 (95% CI 0.54-0.79) and the detection rates were 5.9% and 23.5% for fixed false-positive rates of 5% and 10%, respectively. For the prediction of spontaneous preterm birth before 37 weeks, the area under the curve was 0.58 (95% CI 0.50-0.67) and the detection rates were 5.8% and 18% for fixed false-positive rates of 5% and 10%, respectively. Combined predictive models were studied. To predict spontaneous preterm birth before 34 weeks, the best model was provided by a combination of uterocervical angle and cervical length (area under the curve 0.72; 95% CI 0.58-0.86). The detection rates of this model were 35.3% and 41.2% for fixed false-positive rates of 5% and 10%, respectively. To predict spontaneous preterm birth before 37 weeks of gestation, the best model was provided by a combination of uterocervical angle, cervical length, and previous history of spontaneous preterm birth (area under the curve 0.64; 95% CI 0.55-0.72). The detection rates of this model were 15.4% and 30.8% for fixed false-positive rates of 5% and 10%, respectively. Obese women and those with a history of cesarean section had a wider uterocervical angle. The uterocervical angle, measured mid-trimester, is a poor predictor of spontaneous preterm birth. © 2020 Nordic Federation of Societies of Obstetrics and Gynecology (NFOG). Published by John Wiley & Sons Ltd.

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