Disease Onset and Burden in Patients With Chronic Bronchitis and COPD: A Real-World Evidence Study.

Background: Chronic bronchitis (CB), classically defined as having cough and sputum production for at least 3 months per year for 2 consecutive years, is frequently associated with chronic obstructive pulmonary disease (COPD). Methods: This retrospective cohort study using the Optum Results: Of 104,633,876 patients in the study period between January 2007 and September 2020, 628,545 patients had CB only (i.e., nonobstructive disease), 129,084 had COPD only (COPD cohort), and 77,749 had both COPD and CB (COPD-CB cohort). A total of 75.9% of patients (59,009 of 77,749) fulfilled the criteria for a CB diagnosis before their first diagnosis with COPD, compared with 24.1% who had COPD before being diagnosed with CB. HCRU over 5 years was highest in the COPD-CB cohort, whereas the COPD cohort and CB cohorts had similar HCRU over 5 years. The COPD-CB cohort had a greater percentage of common COPD comorbidities and exposure to more drug classes than the other cohorts. Conclusions: These results highlight the importance of increased attention to CB. CB often precedes the diagnosis of COPD and subsequently leads to high HCRU. Interventions to better manage CB and prevent the progression of CB to COPD could improve morbidity in this population.