Key result
3D color Doppler ultrasound reveals exponential yolk sac volume growth and peak vascularity by 8 weeks.
Why the study?
The study aimed to assess gestational sac and yolk sac volume changes and their relationship with yolk sac vascularity during the first trimester of pregnancy.
How do the volume and vascularity of the gestational and yolk sacs change throughout the first trimester of pregnancy when assessed by three-dimensional and color Doppler ultrasound?
Observational (n=80)
How do the volume and vascularity of the gestational and yolk sacs change throughout the first trimester of pregnancy when assessed by three-dimensional and color Doppler ultrasound?
Three-dimensional ultrasound and color Doppler can effectively track the volume and vascularity of the yolk sac during the first trimester, providing functional and volumetric data on early human development.
Answers are grounded in this paper and cite their sources.
Yolk sac volume-vascularity data remain exploratory; prospective studies needed before any clinical adoption.
The aim of our study was to assess the volume of the gestational sac and yolk sac throughout the first trimester of pregnancy, and to establish the relationship between the yolk sac volume measurements and vascularity visualization rates. Eighty women with uncomplicated singleton pregnancies between 5 and 12 weeks were evaluated by three-dimensional and color Doppler ultrasound (Combison 530, Kretztechnik). Regression analysis revealed exponential rise of the gestational sac volume with gestational age throughout the first trimester. An exponential rise of the yolk sac volume was noticed between gestational weeks 5 and 8, followed by gradual increase of the yolk sac volume between the gestational weeks 8 and 10. After reaching the plateau from 10 to 11 weeks, yolk sac volume started to decrease. The highest visualization rates for the yolk sac vessels were obtained between gestational weeks 7 and 8. When yolk sac reached the maximum size between 10 and 11 weeks, reduced vascularity was demonstrated. Three-dimensional ultrasound allowed estimation of the gestational sac and yolk sac volumes throughout the first trimester of pregnancy. Both of these measurements seem to be useful prognostic parameters for the pregnancy outcome. The combination of functional and volumetric data provides much useful information on early human development.
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Kupešić et al. (1999) conducted an observational in Uncomplicated singleton pregnancies (n=80). Three-dimensional and color Doppler ultrasound was evaluated on Volume of the gestational sac and yolk sac and vascularity visualization rates. Three-dimensional and color Doppler ultrasound demonstrated an exponential rise in yolk sac volume between 5 and 8 weeks, with the highest vascularity visualization rates between 7 and 8 weeks.
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