Poor airway function in early infancy and lung function by age 22 years: a non-selective longitudinal cohort study

Area of Science:

• Respiratory Medicine
• Pediatric Pulmonology
• Epidemiology

Background:

• Lung function in early adulthood is a key predictor of chronic obstructive pulmonary disease (COPD).
• Early life factors influencing adult lung function are not fully understood.
• Investigating early airway function's impact on later lung health is crucial for COPD prevention.

Purpose of the Study:

• To determine if infant airway function, measured shortly after birth, affects lung function in early adulthood.
• To identify early life markers for predicting the development of airflow obstruction.

Main Methods:

• Longitudinal study of non-selected infants (Tucson Children's Respiratory Study, 1980-1984).
• Maximal expiratory flows at functional residual capacity (Vmax(FRC)) measured in infancy (mean 2.3 months).
• Lung function (FEV1, FVC, FEF25-75) assessed at ages 11, 16, and 22 years, with bronchodilator response.

Main Results:

• Infants with the lowest quartile of Vmax(FRC) showed significantly lower FEV1/FVC ratio, FEF25-75, and FEV1 up to age 22.
• These associations remained significant after adjusting for height, weight, age, sex, wheeze, smoking, atopy, and parental asthma.
• The findings highlight a persistent link between early airway mechanics and later obstructive lung disease indicators.

Conclusions:

• Poor airway function in infancy is a significant risk factor for developing airflow obstruction in young adulthood.
• These results suggest that interventions to prevent COPD may need to commence during fetal development.
• Early life respiratory health is critical for long-term lung function and disease prevention.