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Relationship between lung function and asthma symptoms in patients with difficult to control asthma
Summary
In difficult asthma, lung function initially correlates with symptoms, but this link weakens as control improves. Severe airflow obstruction disrupts this relationship, requiring further research for management strategies.
Area of Science:
- Pulmonology
- Respiratory Medicine
- Clinical Asthma Research
Background:
- Asthma control measures often show a weak correlation with lung function.
- Understanding this relationship in difficult-to-control asthma is crucial for effective management.
Purpose of the Study:
- To investigate the correlation between lung function (FEV1%) and asthma control in patients with difficult-to-control asthma.
- To determine if severe fixed airflow obstruction influences this relationship.
Main Methods:
- Prospective cohort study of 59 difficult-to-control asthma patients.
- Measurement of FEV1% and Asthma Control Scores (ACS) at initial and follow-up visits.
- Analysis of correlations, with subgroup analysis excluding patients with severe fixed airflow obstruction.
Main Results:
- Initial visit: FEV1% correlated with activity limitation, shortness of breath, wheezing, and ACS.
- Follow-up: No correlation between FEV1% and asthma control measures overall.
- Excluding severe fixed airflow obstruction: FEV1% correlated with night waking, wheezing, and ACS; improvement in ACS strongly associated with lung function improvement.
Conclusions:
- In difficult asthma, FEV1% correlates with symptoms when control is poor but not when control improves, especially in patients with severe fixed airflow obstruction.
- Severe fixed airflow obstruction masks the relationship between subjective asthma control and objective lung function.
- Further research is needed on preventing, delaying, and managing severe fixed airflow obstruction in asthma.
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