A longitudinal study on the relationship between methacholine airway hyperresponsiveness and exercise-induced bronchoconstriction / 대한내과학회지
Korean Journal of Medicine
; : 472-479, 2009.
Article
in Ko
| WPRIM
| ID: wpr-80327
Responsible library:
WPRO
ABSTRACT
BACKGROUND/AIMS:
The airway hyperresponsiveness (AHR) in asthma has variable and persistent components that are related to airway inflammation and remodeling, respectively. This longitudinal study examined the relationship of airway responses between exercise (reflecting variable AHR) and methacholine (reflecting persistent AHR).METHODS:
The charts were reviewed of 36 young adult males who underwent both methacholine and exercise challenges at different times and were diagnosed with exercise-induced asthma. The severity of the response to each stimulus was scored (0~3).RESULTS:
The mean interval between the baseline and follow-up tests was 9.8 (5~58) months. The AHR score was significantly lower with the exercise challenge than with methacholine at follow-up (1.58+/-0.16 vs 1.19+/-0.15, p<0.01), but not at baseline. Compared to baseline, the AHR score was significantly lower with exercise (1.67+/-0.13 vs 1.19+/-0.15, p<0.01), but not with methacholine, and the difference in the AHR scores between exercise and methacholine increased significantly from baseline to follow-up (0.03+/-0.13 vs 0.39+/-0.13, p<0.05). The maximum fall in the forced expiratory volume in 1 s following exercise was significantly related to methacholine AHR (r=-0.571, p<0.001).CONCLUSIONS:
Exercise-induced bronchoconstriction was significantly related to methacholine AHR. However, the change in methacholine AHR in a follow-up test was significantly lower than that in the exercise response, which might have resulted from persistent worsening of the AHR with time because methacholine AHR reflects both variable and persistent AHR.Key words
Full text:
1
Index:
WPRIM
Main subject:
Asthma
/
Asthma, Exercise-Induced
/
Forced Expiratory Volume
/
Follow-Up Studies
/
Longitudinal Studies
/
Bronchoconstriction
/
Methacholine Chloride
/
Inflammation
Type of study:
Observational_studies
/
Prognostic_studies
Limits:
Humans
/
Male
Language:
Ko
Journal:
Korean Journal of Medicine
Year:
2009
Type:
Article