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Discordancy in triplets

N Mordel1, A Benshushan, G Zajicek

  • 1Department of Obstetrics and Gynecology, Hebrew University Hadassah Medical Center, Jerusalem, Israel.

American Journal of Perinatology
|May 1, 1993
PubMed
Summary
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Triplet newborns show significantly higher birthweight discordancy than twins. This weight difference, while common, does not necessarily indicate pregnancy complications or poor perinatal outcomes.

Area of Science:

  • Perinatology
  • Obstetrics
  • Neonatology

Background:

  • Birthweight discordancy in twins is typically defined as a 15-25% weight difference, occurring in 15-29% of twin gestations.
  • Uncomplicated triplet gestations represent a unique obstetric scenario for studying fetal growth variations.

Purpose of the Study:

  • To investigate the frequency of discordant birthweights among newborns from uncomplicated triplet pregnancies.
  • To compare the rate of discordancy in triplets with that observed in twins.

Main Methods:

  • Analysis of birthweights from 114 normal triplet newborns delivered over an 11-year period.
  • Calculation of weight differences between the largest and smallest infants within each triplet set.
  • Assessment for fetal-fetal transfusion and Apgar score disparities between discordant fetuses.

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Main Results:

  • The mean birthweight of triplet newborns was 1894.2 +/- 468.5 gm.
  • In 58% of triplet sets, the weight difference between the largest and smallest newborn exceeded 15%.
  • Approximately 25% of triplet newborns exhibited a birthweight dissimilarity greater than 25%.

Conclusions:

  • Triplet newborns demonstrate a birthweight discordancy rate approximately double that of twins.
  • Significant birthweight discordancy in triplets is not consistently associated with fetal-fetal transfusion or compromised Apgar scores.
  • Discordancy in triplet gestations does not inherently signify underlying pregnancy complications or adverse perinatal outcomes.