title: Increasing illness severity in very low birth weight infants over a 9-year period.
abstract: BACKGROUND
  Recent reports have documented a leveling-off of survival rates in preterm infants through the 1990's. The objective of this study was to determine temporal changes in illness severity in very low birth weight (VLBW) infants in relationship to the outcomes of death and/or severe IVH.
  
  
  METHODS
  Cohort study of 1414 VLBW infants cared for in a single level III neonatal intensive care unit in Delaware from 1993-2002. Infants were divided into consecutive 3-year cohorts. Illness severity was measured by two objective methods: the Score for Neonatal Acute Physiology (SNAP), based on data from the 1st day of life, and total thyroxine (T4), measured on the 5th day of life. Death before hospital discharge and severe intraventricular hemorrhage (IVH) were investigated in the study sample in relation to illness severity. The fetal death rate was also investigated. Statistical analyses included both univariate and multivariate analysis.
  
  
  RESULTS
  Illness severity, as measured by SNAP and T4, increased steadily over the 9-year study period with an associated increase in severe IVH and the combined outcome of death and/or severe IVH. During the final 3 years of the study, the observed increase in illness severity accounted for 86% (95% CI 57-116%) of the variability in the increase in death and/or severe IVH. The fetal death rate dropped from 7.8/1000 (1993-1996) to 5.3/1000 (1999-2002, p = .01) over the course of the study.
  
  
  CONCLUSIONS
  These data demonstrate a progressive increase in illness in VLBW infants over time, associated with an increase in death and/or severe IVH. We speculate that the observed decrease in fetal death, and the increase in neonatal illness, mortality and/or severe IVH over time represent a shift of severely compromised patients that now survive the fetal time period and are presented for care in the neonatal unit.
authors.affiliation: Department of Pediatrics, Christiana Care Health Services, Newark, DE, USA. paul.d@christianacare.org
authors.forename: David A
authors.initials: DA
authors.lastname: Paul
authors.forename: Kathleen H
authors.initials: KH
authors.lastname: Leef
authors.forename: Robert G
authors.initials: RG
authors.lastname: Locke
authors.forename: Louis
authors.initials: L
authors.lastname: Bartoshesky
authors.forename: Judy
authors.initials: J
authors.lastname: Walrath
authors.forename: John L
authors.initials: JL
authors.lastname: Stefano
mesh_terms: D001724:Birth Weight; D002543:Cerebral Hemorrhage / Q000145:classification / Q000453:epidemiology*; D015331:Cohort Studies; D003691:Delaware / Q000453:epidemiology; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality / Q000639:trends; D007231:Infant, Newborn; D007234:Infant, Premature; D007235:Infant, Premature, Diseases / Q000145:classification / Q000453:epidemiology / Q000401:mortality*; D019102:Infant, Very Low Birth Weight; D007363:Intensive Care Units, Neonatal; D016015:Logistic Models; D015999:Multivariate Analysis; D011247:Pregnancy; D011379:Prognosis; D012720:Severity of Illness Index; D015996:Survival Rate