title: Lung function among infants born preterm, with or without bronchopulmonary dysplasia.
abstract: OBJECTIVE
  Both healthy preterm infants and those with bronchopulmonary dysplasia (BPD) have poor lung function during childhood and adolescence, although there is no evidence whether prematurity alone explains the reduction in lung function found in BPD infants. Our study seeks to know if lung function, measured in infancy by means of rapid thoracic compression with raised volume technique, is different between preterm infants with and without BPD.
  
  
  METHODS
  Lung function was measured in 43 preterm infants with BPD and in 32 preterm infants without BPD at a chronological age range of 2-28 months. Forced vital capacity (FVC), forced expiratory volume at 0.5 sec, and forced expiratory flows at 50, 75, 85%, and 25-75% of FVC were obtained from maximal expiratory volume curves by means of rapid thoracic compression with raised volume technique. Maximal flow at functional residual capacity was measured using rapid thoracic compression at tidal volume. Multiple regression analysis and generalized least squares (GLS) random-effects regression model were used to control for variables such as gender, weeks of gestation, age, birth weight, and tobacco smoke exposure. A sub-analysis was performed in infants born at 28+ weeks of gestation.
  
  
  RESULTS
  BPD was associated to significantly lower flows (regression coefficients: -0.51, -0.54, -57, -0.53, and -0.82, respectively for FEF(50), FEF(75), FEF(85), FEF(25-75)). This association was driven by males and maintained in the subgroup of infants born at 28+ weeks of gestation.
  
  
  CONCLUSIONS
  BPD is associated with an additional decrease of lung function during the first 2 years of life in infants born preterm.
authors.affiliation: Pediatric Respiratory Unit, Virgen de la Arrixaca University Children's Hospital, University of Murcia, Murcia, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Sanchez-Solis
authors.forename: Luis
authors.initials: L
authors.lastname: Garcia-Marcos
authors.forename: Vicente
authors.initials: V
authors.lastname: Bosch-Gimenez
authors.forename: Virginia
authors.initials: V
authors.lastname: Pérez-Fernandez
authors.forename: Maria D
authors.initials: MD
authors.lastname: Pastor-Vivero
authors.forename: Pedro
authors.initials: P
authors.lastname: Mondéjar-Lopez
mesh_terms: D001724:Birth Weight; D001997:Bronchopulmonary Dysplasia / Q000503:physiopathology*; D002675:Child, Preschool; D005260:Female; D005865:Gestational Age; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*; D008168:Lung / Q000503:physiopathology*; D008297:Male; D012129:Respiratory Function Tests; D012737:Sex Factors; D014028:Tobacco Smoke Pollution / Q000009:adverse effects
chemical_list: D014028:Tobacco Smoke Pollution