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Risk factors for and timing of death of extremely preterm infants

Dawn E Elder1, Annie Wong, Jane M Zuccollo

  • 1Department of Paediatrics, School of Medicine and Health Sciences, University of Otago Wellington, Wellington South, New Zealand. dawn.elder@otago.ac.nz

The Australian & New Zealand Journal of Obstetrics & Gynaecology
|August 22, 2009
PubMed

Insights

Extremely preterm infants born between 23 and 28 weeks gestation face high mortality. Lower gestational age and intrauterine growth restriction significantly increase the risk of death, particularly within the first month of life.

Area of Science:

  • Neonatalogy
  • Perinatal Medicine
  • Pediatric Mortality Studies

Background:

  • Extremely preterm infants (23-28 weeks gestation) have high mortality rates.
  • Understanding mortality risk factors is crucial for improving outcomes.
  • Previous studies highlight prematurity as a major concern.

Purpose of the Study:

  • To identify risk factors for the timing and cause of death in extremely preterm infants.
  • To analyze mortality patterns within the first month of life for this vulnerable population.
  • To provide data for targeted interventions and improved neonatal care.

Main Methods:

  • Retrospective review of 479 liveborn infants born between 23 and 28 weeks gestation.
  • Analysis of mortality data over a ten-year period.
  • Statistical examination of risk factors including gestational age and intrauterine growth restriction.

Main Results:

  • 98 deaths were recorded among the 479 infants.
  • 33% of deaths occurred on the first day of life, and 75% within the first month.
  • Lower gestational age and intrauterine growth restriction were identified as significant risk factors for mortality.
  • Mortality was highest in the first week of life for infants with the lowest gestations.

Conclusions:

  • Mortality in extremely preterm infants is concentrated in the first month, especially the first week.
  • Gestational age and intrauterine growth restriction are critical determinants of survival.
  • Neonatal care strategies should focus on the earliest days of life for the most vulnerable infants.

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