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Related Experiment Videos

Acid-base differences in preterm and term twin pregnancy.

S A Ordorica1, I A Hoskins, B K Young

  • 1Department of Obstetrics and Gynecology, New York University Medical Center.

Acta Geneticae Medicae Et Gemellologiae
|January 1, 1991
PubMed
Summary

First-born twins, both preterm and term, show better acid-base status. This difference emerges when the birth interval exceeds one minute, potentially due to reduced placental blood flow for the second twin.

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Area of Science:

  • Neonatal Medicine
  • Perinatology
  • Twin Studies

Background:

  • Twin pregnancies present unique physiological challenges.
  • Assessing neonatal outcomes requires consideration of gestational age and birth dynamics.
  • Acid-base status is a critical indicator of fetal well-being.

Purpose of the Study:

  • To investigate acid-base status differences in twins.
  • To explore the influence of gestational age, birth order, and birth interval.
  • To identify factors affecting neonatal adaptation in twins.

Main Methods:

  • Prospective study of 179 twin sets (68 preterm, 111 term).
  • Analysis of blood-gas data to assess acid-base status.
  • Comparison based on gestational age, birth order, and time interval between births.

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Main Results:

  • Statistically significant differences in acid-base status favoring the first-born twin were observed.
  • These findings were consistent across both preterm and term infants.
  • The differences became apparent when the birth interval exceeded one minute, irrespective of gestational age or delivery method.

Conclusions:

  • Birth order influences neonatal acid-base status in twins.
  • A prolonged birth interval may compromise the second twin's respiratory exchange.
  • Reduced intervillous blood flow post-first twin delivery is a potential mechanism.