Infants With Flow Limitation at 4 Weeks: Outcome at 6 and 11 Years

Am J Respir Crit Care Med. 2002 May 1;165(9):1294-8. doi: 10.1164/rccm.200110-018OC.

Abstract

Within a longitudinal study of lung function in 243 infants, we identified a group of 23 individuals with flow limitation in tidal expiration. In infancy, flow-limited children have reduced lung function and increased airway responsiveness (AR), and at 2 years of age they are diagnosed with asthma more frequently. We hypothesized that these observations would persist throughout childhood. Data from ages 3 to 11 years were analyzed. Only at 4 years of age did the flow-limited group have increased wheeze compared with other cohort members (odds ratio, 4.25; 95% confidence interval [CI], 1.11 to 16.2; p = 0.04; n = 114). At 6 years of age, 117 cohort members were seen. The flow-limited group (n = 14) had greater AR (p = 0.009) and reduced mean FEV(1) (131 ml; 95% CI, 16 to 246; p = 0.03) and FEF(25-75) (0.28 L/second; 95% CI, 0.05 to 0.52; p = 0.02). At 11 years of age, 183 children were seen and the flow-limited group (n = 18) had greater AR (p = 0.02) and a trend toward reduced mean FEF(25-75) (0.24 L/second; 95% CI, -0.02 to 0.49; p = 0.08). Atopy and parental asthma were not increased in the flow-limited group. We suggest that the physiologic abnormality that causes flow limitation in early infancy may identify an at-risk group, different from asthma, who have reduced lung function and increased airway responsiveness in later life.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Child
  • Eosinophils
  • Forced Expiratory Flow Rates
  • Forced Expiratory Volume
  • Humans
  • Infant, Newborn
  • Leukocyte Count
  • Longitudinal Studies
  • Multivariate Analysis
  • Pulmonary Ventilation*
  • Regression Analysis
  • Respiratory Hypersensitivity / epidemiology
  • Respiratory Hypersensitivity / physiopathology*
  • Statistics, Nonparametric
  • Western Australia / epidemiology