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Related Experiment Videos

Amniotic fluid accumulation in the first trimester

J C Birnholz1, A E Madanes

  • 1Diagnostic Ultrasound Consultants, Oak Brook, Illinois 60521, USA.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|August 1, 1995
PubMed
Summary
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First-trimester amniotic fluid volume, measured sonographically, increases exponentially with fetal growth after 9 weeks. Excessive fluid may indicate missed abortion, establishing new standards for first-trimester fluid dynamics.

Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Diagnostic Ultrasound

Background:

  • Amniotic fluid volume is crucial for fetal development and well-being.
  • Understanding first-trimester amniotic fluid dynamics is essential for early pregnancy assessment.

Purpose of the Study:

  • To estimate amniotic fluid volume sonographically in early pregnancy.
  • To correlate fluid volume with fetal length and heart rate.
  • To establish standards for normal and abnormal amniotic fluid volume in the first trimester.

Main Methods:

  • Sonographic estimation of amniotic fluid volume in 507 first-trimester pregnancies with living fetuses and 99 instances of missed abortion.
  • Correlation of fluid volume with fetal length and average heart rate for living fetuses.

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Main Results:

  • Amniotic fluid volume demonstrated exponential increase after 9 weeks of gestation, correlating with fetal length.
  • Fluid volume was found to be excessively high in cases of missed abortion.
  • Proposed standards for amniotic fluid volume dynamics in the first trimester.

Conclusions:

  • Amniotic fluid volume is a dynamic physiologic variable in the first trimester.
  • Sonographic assessment of amniotic fluid volume can aid in identifying pregnancies at risk, such as those with missed abortion.
  • Established standards provide a reference for normal first-trimester amniotic fluid volume.