[The incidence and structure of the congenital malformations in very low birth weight liveborn infants over 1991-1995 at the Maternity Home of the State University Hospital, Sofia].

This retrospective study, performed in University Maternity Hospital "Maĭchin dom"--Sofia for the period 1991-1995, shows that the frequency of congenital malformations among the live born VLBW neonates is approximately 6 times higher than those among newborns, weighing above 1500 g. Central nervous system anomalies occur the first place of the structure of congenital malformations in the first group, followed by anomalies of the cardio-vascular system and polymalformative syndromes. Great malformations are the main reason for dying in the neonatal period in newborns, weighing above 1500 g, while in VLBW infants they come on third place after perinatal asphyxia and intraventricular hemorrhages.