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Updated: May 22, 2025

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Bronchodilator responsiveness and future chronic airflow obstruction: a multinational longitudinal study.

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Area of Science:

  • Pulmonology
  • Epidemiology
  • Respiratory Medicine

Background:

  • Bronchodilator responsiveness testing is primarily utilized for diagnosing asthma.
  • The association between bronchodilator responsiveness and the progression to chronic airflow obstruction over time is not well-established.
  • This study investigates bronchodilator responsiveness as a potential predictor of chronic airflow obstruction development.

Purpose of the Study:

  • To determine if bronchodilator responsiveness at baseline is associated with the incidence of chronic airflow obstruction.
  • To explore potential differences in this association based on gender and smoking status.

Main Methods:

  • Utilized data from the multinational Burden of Obstructive Lung Disease (BOLD) cohort study, including 3701 adults aged 40+.
  • Collected baseline and follow-up spirometry data (mean follow-up 9.1 years) to assess bronchodilator responsiveness and chronic airflow obstruction (post-bronchodilator FEV1/FVC < lower limit of normal).
  • Employed multi-level regression models, stratified by gender, with sensitivity analysis in never-smokers.

Main Results:

  • Individuals with baseline bronchodilator responsiveness had a 36% increased risk of developing chronic airflow obstruction (RR: 1.36).
  • The association was more pronounced in women (RR: 1.45) compared to men (RR: 1.07).
  • Never-smokers with bronchodilator responsiveness also showed a significantly higher risk (RR: 1.48).

Conclusions:

  • Bronchodilator responsiveness appears to be a significant risk factor for incident chronic airflow obstruction.
  • The findings suggest that bronchodilator responsiveness may have implications beyond asthma diagnosis, potentially indicating a predisposition to COPD.
  • Further validation in other large population-based cohorts is recommended to confirm these results.