Bronchiectasis in Low-Dose CT Screening for Lung Cancer

Area of Science:

• Pulmonary Medicine
• Radiology
• Epidemiology

Background:

• Bronchiectasis is a chronic lung condition linked to reduced lung function, increased healthcare utilization, and higher mortality.
• Early detection and characterization of bronchiectasis are crucial for managing associated cardiopulmonary diseases.

Purpose of the Study:

• To determine the prevalence and severity of bronchiectasis in participants of a low-dose CT (LDCT) screening program.
• To identify clinical findings associated with bronchiectasis in this cohort.

Main Methods:

• A quantitative scoring system, the Early Lung and Cardiac Action Program (ELCAP) bronchiectasis score, was used for assessment.
• LDCT scans from 2191 smokers (aged 40-90) enrolled in a prospective screening study were reviewed.
• Medical records were analyzed for respiratory symptoms and acute respiratory events within two years post-LDCT.

Main Results:

• Bronchiectasis was identified in 23% (504/2191) of participants, with a median ELCAP score of 12.
• Higher ELCAP scores correlated with increased prevalence in lower lobes and midlung involvement.
• Factors associated with bronchiectasis included older age, former smoking status, COPD, elevated hemidiaphragm, and consolidation; it was less frequent in overweight/obese individuals.
• Increasing ELCAP score severity was significantly associated with more frequent respiratory symptoms and acute respiratory events requiring hospitalization.

Conclusions:

• The prevalence of bronchiectasis is substantial in smokers undergoing LDCT screening.
• The ELCAP bronchiectasis score effectively quantifies disease severity and correlates with increased respiratory morbidity.