Lung function distinguishes preschool children with CF from healthy controls in a multi-center setting

Gwendolyn S. Kerby, Margaret Rosenfeld, Clement L. Ren, Oscar H. Mayer, Lyndia Brumback, Robert Castile, Meeghan A. Hart, Peter Hiatt, Margaret Kloster, Robin Johnson, Paul Jones, Stephanie D. Davis

Research output: Contribution to journalReview article

25 Scopus citations


Rationale Conducting clinical trials in cystic fibrosis (CF) preschoolers has been limited by lack of sensitive lung function measures performed across sites. Objectives (1) Assess feasibility and short-term reproducibility of spirometry, forced oscillometry (FO), and inductance plethysmography (IP) in a multi-center preschool population; (2) compare ability of each technique to differentiate lung function of CF preschoolers and controls; (3) evaluate longitudinal changes in lung function; (4) estimate sample sizes for future trials. Methods A longitudinal, multi-center study of CF preschoolers was conducted utilizing standardized equipment, rigorous site training, and centralized lung function data review. CF subjects participated in up to four study visits 6 months apart, plus a 2-week reproducibility visit. Controls had one study visit. Results Ninety-three CF subjects and 87 controls participated. Acceptability rates were lowest for spirometry (55%) and highest for IP (77%). Spirometry success increased with age and having a prior acceptable measurement. FEV 1, FEV 0.5, and FEF 25-75 were lower for CF subjects than for controls; spirometric z-scores declined with age. IP measures of thoracoabdominal asynchrony were greater for CF subjects than for controls. FO indices did not distinguish CF from controls. FEV 1 and FEV 0.5 are able to detect the smallest treatment effect for a given sample size. Conclusions Spirometry appears more sensitive than IP or FO for detecting lung disease in CF preschoolers; spirometric indices decline with age. Future trials using spirometry should include a run-in period for training and require acceptable data prior to enrollment. However, near-normal spirometric measurements in CF preschoolers may lead to difficulty detecting a treatment effect.

Original languageEnglish (US)
Pages (from-to)597-605
Number of pages9
JournalPediatric pulmonology
Issue number6
StatePublished - Jun 2012
Externally publishedYes


  • forced expired volume (mesh terms)
  • forced oscillometry
  • inductance plethysmography
  • preschoolers
  • spirometry

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Pulmonary and Respiratory Medicine

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    Kerby, G. S., Rosenfeld, M., Ren, C. L., Mayer, O. H., Brumback, L., Castile, R., Hart, M. A., Hiatt, P., Kloster, M., Johnson, R., Jones, P., & Davis, S. D. (2012). Lung function distinguishes preschool children with CF from healthy controls in a multi-center setting. Pediatric pulmonology, 47(6), 597-605.