title: Pulmonary artery pressure: early predictor of chronic lung disease in preterm infants.
abstract: OBJECTIVE
  To determine if pulmonary artery pressure (PAP) in ventilated preterm infants is independently associated with the development of chronic lung disease (CLD) and whether early assessment has any prognostic value.
  
  
  METHODS
  Two cohorts (development n = 55; and validation n = 28) of preterm infants were studied at 24 hours of age. PAP was assessed non-invasively using its inverse correlation with the corrected acceleration time to right ventricular ejection time ratio (AT:RVET(c)), calculated from the pulmonary artery Doppler waveform. Clinical and respiratory variables were also collected. Using logistic regression analysis to identify factors independently associated with CLD, a prognostic score was developed to predict CLD. The ability of the score to predict CLD was described using receiver operating characteristic (ROC) curves.
  
  
  RESULTS
  Birthweight, inspired oxygen concentration, and AT:RVET(c) were independently predictive of CLD. The area under the ROC curve was 0.96 for the development and 0.89 for the validation cohort. Exclusion of AT:RVET(c) resulted in a reduction to 0.88 and 0.73, respectively.
  
  
  CONCLUSIONS
  PAP is independently associated with CLD. An early assessment of PAP using AT:RVET(c) may permit the early prediction of CLD as part of a multifactorial scoring system.
authors.affiliation: Department of Child Health, University of Liverpool.
authors.forename: N V
authors.initials: NV
authors.lastname: Subhedar
authors.forename: A H
authors.initials: AH
authors.lastname: Hamdan
authors.forename: S W
authors.initials: SW
authors.lastname: Ryan
authors.forename: N J
authors.initials: NJ
authors.lastname: Shaw
mesh_terms: D001794:Blood Pressure / Q000502:physiology; D002908:Chronic Disease; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology; D007235:Infant, Premature, Diseases / Q000503:physiopathology*; D008171:Lung Diseases / Q000503:physiopathology*; D008297:Male; D011379:Prognosis; D011651:Pulmonary Artery / Q000503:physiopathology*; D012372:ROC Curve; D012044:Regression Analysis; D012121:Respiration, Artificial