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First-trimester uterine artery Doppler velocimetry in the prediction of birth weight in a low-risk population

Authors

  • Andres Sarmiento,

    1. Division of Maternal–Fetal Medicine, Department of Gynecology, Obstetrics, and Human Reproduction, Fundación Santa Fe de Bogota University Hospital, IMAFET Group, Bogota, Colombia
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  • Alexandra Casasbuenas,

    Corresponding author
    1. Division of Maternal–Fetal Medicine, Department of Gynecology, Obstetrics, and Human Reproduction, Fundación Santa Fe de Bogota University Hospital, IMAFET Group, Bogota, Colombia
    • Fetal Medicine Center, Fetal Medicine Interest Group GIMEF, Santiago, Chile
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  • Nadiezhda Rodriguez,

    1. Division of Maternal–Fetal Medicine, Department of Gynecology, Obstetrics, and Human Reproduction, Fundación Santa Fe de Bogota University Hospital, IMAFET Group, Bogota, Colombia
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  • Ana M. Angarita,

    1. Division of Maternal–Fetal Medicine, Department of Gynecology, Obstetrics, and Human Reproduction, Fundación Santa Fe de Bogota University Hospital, IMAFET Group, Bogota, Colombia
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  • Piedad Sarmiento,

    1. Division of Maternal–Fetal Medicine, Department of Gynecology, Obstetrics, and Human Reproduction, Fundación Santa Fe de Bogota University Hospital, IMAFET Group, Bogota, Colombia
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  • Waldo Sepulveda

    1. Fetal Medicine Center, Fetal Medicine Interest Group GIMEF, Santiago, Chile
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  • Funding sources: W. S. was supported by an unrestricted research grant from the Sociedad Profesional de Medicina Fetal “Fetalmed” Limitada, Chile.

  • Conflicts of interest: None declared

Alexandra Casasbuenas. E-mail: alexacasasbuenas@gmail.com

ABSTRACT

Objective

To study the relationship between first-trimester uterine artery (UtA) Doppler velocimetry and birth weight in an unselected, low-risk obstetric population.

Methods

This is a prospective study of 415 low-risk pregnant women who underwent a first-trimester ultrasound evaluation between 11 and 13 weeks of gestation. Blood flow velocimetry waveforms from both UtAs were obtained and the pulsatility index (PI) measured and recorded. Clinical records were reviewed for pregnancy outcomes. Birth weight was expressed as z-scores, and the Spearman correlation coefficient (ρ) was used to calculate the relationship between the mean, delta, and lowest UtA PI values and birth weight.

Results

There was no correlation between the mean and delta UtA PI values and birth weight. However, a significant correlation between the lowest UtA PI value and birth weight (ρ = −0.121; p = 0.013) was noted.

Conclusions

Our study found a clinically significant correlation between the lowest UtA PI value and birth weight in an unselected, low-risk pregnant population. Because fetal growth is a multifactorial process in which placentation is only one of the factors involved, the use of a single parameter such as Doppler velocimetry remote from the delivery to predict birth weight in a low-risk population seems to be less useful than in the high-risk population. © 2012 John Wiley & Sons, Ltd.

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