Association of isolated single umbilical artery with small for gestational age and preterm birth

Ashley N. Battarbee*, Anna Palatnik, Linda M Ernst, William A Grobman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

OBJECTIVE: To assess the association of an isolated single umbilical artery with small for gestational age (SGA) and preterm birth. METHODS: In this retrospective cohort study, 219 consecutive women carrying a fetus with an isolated single umbilical artery diagnosed during routine secondtrimester anatomic survey were compared with 219 women carrying a fetus with a three-vessel cord. Pregnancies with fetal anomalies or aneuploidy were excluded from the analysis. Outcomes included pregnancy-induced hypertension, gestational age at birth, birth weight, SGA, defined as birth weight less than the 10th percentile, and indicated or spontaneous preterm birth, defined as delivery before 37 weeks of gestation. RESULTS: In univariable analysis, the presence of an isolated single umbilical artery was significantly associated with lower birth weight (3,146 compared with 3,430 g) and with SGA (11.9% compared with 2.7%; P,.001 for each outcome). The rates of pregnancy-induced hypertension (7.3% compared with 1.8%, P=.01) and indicated but not spontaneous preterm delivery (5.5% compared with 0.9%, P=.01 for indicated and 8.2% compared with 4.6%, P=.12 for spontaneous) were also more common in pregnancies with an isolated single umbilical artery. In multivariable analysis controlling for potential confounders, an isolated single umbilical artery remained associated with SGA, pregnancy-induced hypertension, and medically indicated preterm birth (adjusted odds ratio [OR] 3.97, confidence interval [CI] 1.55-10.12; adjusted OR 3.50, CI 1.10-11.18; adjusted OR 7.35, CI 1.60-33.77, respectively). CONCLUSION: Pregnancies complicated by isolated single umbilical artery are at increased risk for SGA and pregnancy-induced hypertension but not for spontaneous preterm birth.

Original languageEnglish (US)
Pages (from-to)760-764
Number of pages5
JournalObstetrics and gynecology
Volume126
Issue number4
DOIs
StatePublished - Oct 1 2015

ASJC Scopus subject areas

  • Obstetrics and Gynecology

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