Related Experiment Videos
The correlation between exercise-induced bronchoconstriction and bronchial methacholine sensitivity in asthma
Pediatrics
|November 1, 1975
Summary
Asthma patients sensitive to methacholine are likely to experience exercise-induced bronchoconstriction (EIB). This study found a strong link between methacholine bronchial sensitivity and EIB, indicating a specific reaction pattern in asthma.
Area of Science:
- Pulmonology
- Clinical Medicine
- Respiratory Physiology
Background:
- Exercise-induced bronchoconstriction (EIB) is a common asthma symptom.
- Bronchial sensitivity to cholinergic agents like methacholine is a known asthma marker.
Purpose of the Study:
- To investigate the relationship between bronchial sensitivity to methacholine and the occurrence of EIB.
- To determine if methacholine responsiveness predicts exercise-induced asthma.
Main Methods:
- 57 asthma patients underwent methacholine challenge testing.
- On the same day, subjects performed an exercise challenge to assess for EIB.
- A positive reaction was defined as a ≥15% fall in peak expiratory flow rate.
Main Results:
- A significant correlation (P < .001) was observed between methacholine sensitivity and EIB.
- 33 out of 45 methacholine-reactive patients developed EIB.
- None of the 12 methacholine non-reactive patients developed EIB.
Conclusions:
- Bronchial hyperresponsiveness to methacholine is strongly associated with EIB in asthma patients.
- The findings suggest that bronchoconstriction induced by either methacholine or exercise is a specific asthmatic reaction.
- Methacholine challenge may help predict the likelihood of developing EIB.