title: Respiratory health in prematurely born preschool children with and without bronchopulmonary dysplasia.
abstract: OBJECTIVE
  To investigate the respiratory health of preterm infants with bronchopulmonary dysplasia (BPD) at preschool age and to determine whether lung function (measured by forced oscillation technique (FOT) and interruption technique (Rint) is affected by BPD in preterm infants compared with preterm infants without BPD.
  
  
  METHODS
  
  
  
  METHODS
  3 to 5 years of age born preterm with BPD (N = 40, mean gestational age 28 weeks, mean birth weight 1051 g), and without BPD (N = 36, mean gestational age 29 weeks, mean birth weight 1179 g).
  
  
  METHODS
  prevalence of symptoms determined by European Community Respiratory Health Survey and lung function measured by FOT and Rint.
  
  
  RESULTS
  A large percentage of infants in both preterm groups reported respiratory symptoms during the last 12 months. Lung function measurements showed higher resonant frequency (Hz) in BPD compared with non-BPD (mean 26.8 vs 22.7, P < .001) and lower mean reactance X(4-24) (hPa.s/l)(-3.0 vs -1.9, P = .005). No differences were found in respiratory resistance between the groups, although the mean values of both groups were increased compared with reference values.
  
  
  CONCLUSIONS
  Preterm birth affects respiratory health at 3 to 5 years of age. Children with BPD could be distinguished from children without BPD based on a higher resonant frequency and a lower mean reactance.
authors.affiliation: Department of Pediatric Pulmonology, University Medical Center Groningen, University of Groningen, The Netherlands. e.j.l.e.vrijlandt@bkk.umcg.nl
authors.forename: E J L E
authors.initials: EJ
authors.lastname: Vrijlandt
authors.forename: H M
authors.initials: HM
authors.lastname: Boezen
authors.forename: J
authors.initials: J
authors.lastname: Gerritsen
authors.forename: E F
authors.initials: EF
authors.lastname: Stremmelaar
authors.forename: E J
authors.initials: EJ
authors.lastname: Duiverman
mesh_terms: D000367:Age Factors; D001724:Birth Weight; D001997:Bronchopulmonary Dysplasia / Q000150:complications* / Q000175:diagnosis* / Q000628:therapy; D016022:Case-Control Studies; D002675:Child, Preschool; D015331:Cohort Studies; D002658:Developmental Disabilities / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D010102:Oxygen Inhalation Therapy; D015995:Prevalence; D011379:Prognosis; D012016:Reference Values; D012129:Respiratory Function Tests; D015656:Respiratory Mechanics; D012143:Respiratory Physiological Phenomena; D012737:Sex Factors; D018709:Statistics, Nonparametric