Airway Mucus Plugs in Community-Living Adults: A Study Protocol

Area of Science:

• Pulmonary Medicine
• Radiology
• Genetics

Background:

• Mucus pathology is a significant factor in airway diseases like Chronic Bronchitis (CB) and Chronic Obstructive Pulmonary Disease (COPD).
• Clinical symptoms of mucus pathology affect up to 32% of community-dwelling individuals.
• Systematic study of airway mucus pathology in the general population is lacking.

Purpose of the Study:

• To objectively assess mucus pathology using chest CT scans in community-living individuals.
• To determine the clinical relevance of CT-identified mucus plugs.
• To identify modifiable and genetic factors associated with mucus plugs.

Main Methods:

• Utilizing chest CT scans from the Coronary Artery Risk Development in Young Adults (CARDIA) and Framingham Heart Study (FHS) cohorts.
• Analyzing associations between mucus plugs, lung function (FEV1), respiratory symptoms, and chronic bronchitis.
• Investigating the impact of modifiable factors (air pollution, marijuana smoking, cardiorespiratory fitness) and genetic variants (using TOPMed data).

Main Results:

• CT-based mucus plugs are associated with impaired lung health, including reduced FEV1 and increased respiratory symptoms.
• Persistent mucus plugs may predict future decline in FEV1 and COPD development.
• Modifiable factors like air pollution and marijuana smoking are linked to increased odds of mucus plugs, while fitness may be protective.

Conclusions:

• CT imaging provides an objective measure for assessing mucus pathology in community populations.
• Identifying risk and protective factors for mucus plugs can inform targeted interventions for airway diseases.
• Genetic factors play a role in susceptibility and resilience to mucus pathology.