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  • Title: Estimated fetal weight by ultrasound: a modifiable risk factor for cesarean delivery?
    Author: Little SE, Edlow AG, Thomas AM, Smith NA.
    Journal: Am J Obstet Gynecol; 2012 Oct; 207(4):309.e1-6. PubMed ID: 22902073.
    Abstract:
    OBJECTIVE: The purpose of this study was to investigate whether knowledge of ultrasound-obtained estimated fetal weight (US-EFW) is a risk factor for cesarean delivery (CD). STUDY DESIGN: Retrospective cohort from a single center in 2009-2010 of singleton, term live births. CD rates were compared for women with and without US-EFW within 1 month of delivery and adjusted for potential confounders. RESULTS: Of the 2329 women in our cohort, 50.2% had US-EFW within 1 month of delivery. CD was significantly more common for women with US-EFW (15.7% vs 10.2%; P < .001); after we controlled for confounders, US-EFW remained an independent risk factor for CD (odds ratio, 1.44; 95% confidence interval, 1.1-1.9). The risk increased when US-EFW was >3500 g (odds ratio, 1.8; 95% confidence interval, 1.3-2.7). CONCLUSION: Knowledge of US-EFW, above and beyond the impact of fetal size itself, increases the risk of CD. Acquisition of US-EFW near term appears to be an independent and potentially modifiable risk factor for CD.
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