title: Increasing incidence of respiratory distress in neonates.
abstract: OBJECTIVE
  To document the change in the incidence of respiratory distress (RD), related interventions and mortality in neonates admitted to primary, secondary and tertiary neonatal units within a geographically defined population over a period of 30 years.
  
  
  METHODS
  RD was defined as a clinical picture irrespective of the etiology. Information was collected retrospectively for 1974, 1984, 1994 and 2004 from all neonatal units in Switzerland.
  
  
  RESULTS
  In the 30 years studied the proportion of infants hospitalized with RD increased from 1.9% to 3.8% of the whole neonatal population and from 30% to 53% of all infants admitted to a neonatal unit. Treatment of RD changed significantly. Mechanical ventilation decreased from 31% to 16%, nasal CPAP increased from almost 0% to 26% and surfactant administration increased from 0% to 53% in infants with hyaline membrane disease. Overall mortality decreased in infants with RD from 15.5% to 3.5%.
  
  
  CONCLUSIONS
  The incidence of RD in infants admitted to neonatal units doubled over the last 30 years in a geographically defined neonatal population. This rise can predominantly be ascribed to infants with birth weight >2500 g and may reflect the corresponding increase in the rate of caesarean section.
authors.affiliation: Division of Neonatology, Department of Obstetrics and Gynecology, University Hospital Zurich, Switzerland.
authors.forename: Joerg
authors.initials: J
authors.lastname: Ersch
authors.forename: Matthias
authors.initials: M
authors.lastname: Roth-Kleiner
authors.forename: Peter
authors.initials: P
authors.lastname: Baeckert
authors.forename: Hans Ulrich
authors.initials: HU
authors.lastname: Bucher
mesh_terms: D016009:Chi-Square Distribution; D005260:Female; D005843:Geography; D006801:Humans; D015994:Incidence; D007230:Infant, Low Birth Weight / Q000502:physiology*; D007231:Infant, Newborn; D007363:Intensive Care Units, Neonatal / Q000706:statistics & numerical data*; D008297:Male; D012044:Regression Analysis; D012121:Respiration, Artificial / Q000706:statistics & numerical data / Q000639:trends; D012127:Respiratory Distress Syndrome, Newborn / Q000453:epidemiology* / Q000401:mortality / Q000628:therapy; D012189:Retrospective Studies; D017678:Sex Distribution; D011795:Surveys and Questionnaires; D013557:Switzerland / Q000453:epidemiology; D014600:Utilization Review