The association between cervical dysplasia, a short cervix, and preterm birth

Emily S. Miller*, Allie Sakowicz, William A. Grobman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Objective We sought to determine whether cervical dysplasia in the absence of an excisional procedure is associated with an increased risk of preterm birth (PTB) and whether that risk is independent of the presence of a short cervix. Study Design This is a cohort study including women with a singleton pregnancy who underwent routine cervical length assessment between 18-23 6/7 weeks of gestation, stratified by cervical dysplasia (ie, no prior dysplasia, prior dysplasia but no excisional procedure, or prior excisional procedure). The frequency of a short cervix (≤2.5 cm) and PTB were compared between groups and multivariable analyses were performed to identify whether: (1) dysplasia alone or a prior excisional procedure was associated with PTB; and (2) whether these factors remained independently associated with PTB after adjusting for the presence of a short cervix. Results Of the 18,528 women who met inclusion criteria, 3023 (16.3%) had prior dysplasia alone and 1356 (7.3%) had a prior excisional procedure. The frequency of a short cervix for women without dysplasia, with prior dysplasia alone, or with a prior excisional procedure was 0.8%, 1.0%, and 2.2%, respectively (P <.001). The frequency of PTB, respectively, was 6.4%, 6.5%, and 8.4% (P <.001). After adjusting for potential confounding factors, prior excisional procedure but not prior dysplasia alone was associated with PTB. Conclusion Having a prior cervical excisional procedure but not dysplasia alone is associated with an increased risk of PTB. This association is independent of the presence of a short cervix.

Original languageEnglish (US)
Pages (from-to)543.e1-543.e4
JournalAmerican journal of obstetrics and gynecology
Volume213
Issue number4
DOIs
StatePublished - Oct 1 2015

Keywords

  • cervical dysplasia
  • excisional procedure
  • loop electrosurgical excision procedure
  • preterm birth

ASJC Scopus subject areas

  • Obstetrics and Gynecology

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