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Perinatal mortality in breech presentation sibships

S Albrechtsen1, S Rasmussen, K Dalaker

  • 1Medical Birth Registry of Norway, University of Bergen, Haukeland University Hospital. susanne.albrechtsen@mfr.uib.no

Obstetrics and Gynecology
|October 30, 1998
PubMed
Summary

Women with recurring breech presentations have lower perinatal mortality. Subsequent non-breech siblings after a breech birth showed surprising increased mortality, suggesting complex familial risks.

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Area of Science:

  • Perinatal Medicine
  • Obstetrics
  • Epidemiology

Background:

  • Breech presentation is associated with increased perinatal mortality.
  • Delivery method (vaginal vs. cesarean) impacts outcomes.
  • Sibship analysis can reveal familial risk factors.

Purpose of the Study:

  • To compare perinatal mortality in breech presentations delivered vaginally versus by cesarean.
  • To investigate perinatal mortality within sibships for breech presentations.
  • To identify risk factors influencing perinatal outcomes in breech births.

Main Methods:

  • Population-based national registry study (1967-1994).
  • Maternal record linkage of sibships (first to third birth).
  • Logistic regression analysis to calculate adjusted odds ratios for perinatal mortality.

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Main Results:

  • Overall perinatal mortality was higher in breech presentations (4.3x) and vaginal deliveries (5.4x) compared to cesarean.
  • Birth order influenced breech outcomes, with lower mortality in first births.
  • Recurring breech presentations had lower adverse perinatal outcomes.
  • Subsequent non-breech siblings of breech births showed increased mortality.

Conclusions:

  • Recurring breech presentation may indicate lower risk due to biological or improved care factors.
  • Familial risk factors, beyond current presentation, influence perinatal mortality.
  • Further research is needed to understand the increased mortality in subsequent non-breech siblings.