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Reduction of soft tissue deposition in normal triplets.

T Hata1, R L Deter, R M Hill

  • 1Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas.

Journal of Clinical Ultrasound : JCU
|November 1, 1991
PubMed
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Fetal growth models overestimate triplet birth weight due to reduced subcutaneous tissue. This study compared fetal growth parameters in triplets and singletons, revealing significant differences in abdominal circumference, thigh circumference, and weight predictions.

Area of Science:

  • Perinatology
  • Fetal Medicine
  • Biometry

Background:

  • Previous studies indicated Rossavik growth models overestimate birth weight in triplets.
  • The cause of this systematic overestimation in multiple births requires further investigation.

Purpose of the Study:

  • To investigate the reasons for overestimation of fetal weight in triplets compared to singletons.
  • To analyze deviations in head circumference (HC), abdominal circumference (AC), thigh circumference (ThC), and estimated weight (WT) during the third trimester.

Main Methods:

  • Studied 13 normal triplet and 20 normal singleton fetuses using individual growth curve standards.
  • Analyzed average mean percent deviations for HC, AC, ThC, and WT at various points in the third trimester.
  • Compared actual and predicted birth measurements and assessed Nutrition Score values.

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Main Results:

  • Head circumference deviations were near zero for both groups.
  • Abdominal circumference deviations were similar and constant for singletons and triplets.
  • Thigh circumference and weight deviations decreased in triplets towards term, unlike singletons. Systematic differences were larger in triplets for ThC and WT. Nutrition Score was lower in triplets.

Conclusions:

  • Reduced subcutaneous tissue in triplets contributes to the overestimation of fetal weight by growth models.
  • Growth models may require adjustments for accurately predicting birth weight in multiple gestations.
  • Differences in fetal biometry between singletons and triplets highlight the need for tailored growth assessment.