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[Neonatal mortality in infants with very low birth weights in the county of North Jutland. Retrospective study].

The object of this investigation was to review the neonatal mortality among infants with very low birthweights (less than or equal to 1,500 gram) in the County of North Jutland and to determine the distribution of the main causes of death. It is important to note that, in a review of this type, the material was unselected. The period involved was 1988-1989. During this period, 86 infants with very low birthweights were born and 63 of these survived for longer than 28 days, corresponding to a neonatal survival of 73%. The survival increased from 11% in infants weighing 500-700 gram at birth to 93% for infants with birthweights between 1,250-1,500 gram from 0% with gestational ages of 24-25 weeks to 98% with gestational ages greater than or equal to 30 weeks. No significant differences in survival were observed as regards sex, place of delivery, method of delivery and singleton/twin delivery but survival was markedly dependent on whether the infants had asphyxia on delivery. The commonest causes of death were the respiratory distress syndrome, periventricular haemorrhage and asphyxia, followed by sepsis, enterocolitis necrotans and immaturity. The incidence of immediate sequelae in the form of chronic pulmonary disease and the retinopathy of prematurity were low.