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Clinical Associations of Mucus Plugging in Moderate to Severe Asthma
Rory Chan1, Chary Duraikannu2, Brian Lipworth1
1Scottish Centre for Respiratory Research, School of Medicine, University of Dundee, Ninewells Hospital, Dundee, Scotland, United Kingdom.
Background:
Mucus plugging is recognized as a contributory factor to airway obstruction and symptoms in persistent asthma.
Objective:
We aimed to determine phenotypic associations of mucus plugging in patients with moderate to severe asthma in a real-life clinic setting.
Methods:
Mucus plugs (MPs) were identified by a thoracic radiologist upon high-resolution computed tomography imaging. A MP score was subsequently calculated and analyzed along with type 2 biomarkers, spirometry, severe exacerbations, and asthma control for 126 patients with moderate to severe asthma before biologic therapy.
Results:
Asthma patients with MP had significantly worse FEV1%, forced expiratory flow at 25% to 75% of FVC percent, and FEV1/FVC as well as higher levels of peripheral blood eosinophils, FeNO, total IgE, and Aspergillus fumigatus IgE titers, and had previously experienced more frequent severe exacerbations. FEV1/FVC, more than two exacerbations per year, blood eosinophils, total IgE, and A fumigatus IgE titers were associated with MPs after adjusting for confounders.
Conclusions:
Poorly controlled asthma patients with MPs exhibited significantly worse airflow obstruction and greater type 2 inflammation associated with more frequent severe exacerbations. Impaired spirometry, more frequent exacerbations, raised blood eosinophils, total IgE, and A fumigatus IgE increased the likelihood of MPs.
Insights
Mucus plugging in asthma is linked to worse lung function and more severe symptoms. Identifying these mucus plugs (MPs) can help predict asthma severity and guide treatment decisions.
Area of Science:
- Pulmonary Medicine
- Respiratory Research
- Clinical Immunology
Background:
- Mucus plugging is a known factor contributing to airway obstruction and symptoms in persistent asthma.
- Understanding the phenotypic associations of mucus plugging is crucial for managing moderate to severe asthma.
Purpose of the Study:
- To determine the phenotypic associations of mucus plugging (MPs) in patients with moderate to severe asthma in a real-world clinical setting.
- To analyze the relationship between mucus plugging and type 2 biomarkers, spirometry, exacerbations, and asthma control.
Main Methods:
- Mucus plugs (MPs) were identified using high-resolution computed tomography (HRCT) imaging and scored by a radiologist.
- Analysis included 126 patients with moderate to severe asthma, assessing MP score against type 2 biomarkers, spirometry, exacerbation history, and asthma control prior to biologic therapy.
Main Results:
- Asthma patients with MPs showed significantly worse spirometry (FEV1%, FEF25-75%, FEV1/FVC) and higher levels of type 2 biomarkers (blood eosinophils, FeNO, total IgE, Aspergillus fumigatus IgE).
- More frequent severe exacerbations were also associated with the presence of MPs.
- Adjusted analyses confirmed associations between MPs and FEV1/FVC, frequent exacerbations, blood eosinophils, total IgE, and A. fumigatus IgE titers.
Conclusions:
- Mucus plugging in poorly controlled asthma correlates with worse airflow obstruction and increased type 2 inflammation.
- Factors such as impaired spirometry, frequent exacerbations, elevated blood eosinophils, total IgE, and A. fumigatus IgE increase the likelihood of mucus plugging.
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