Efficacy of treatment of chronic obstructive pulmonary disease after virus-induced exacerbations

Viral respiratory infection is one of the main etiologic factors for acute exacerbations of COPD (AECOPD). The disease course after virus-associated AECOPD and the response to treatment have not been studied adequately.The aim was to evaluate the efficacy of single-inhaler triple therapy (SITT) of long-acting anticholinergic drugs (LAMA)/long-acting β2-agonists (LABA) of adrenergic receptors/inhaled glucocorticosteroids (ICS) on COPD symptoms, lung function, exercise tolerance, and inflammatory activity compared with multiple-inhaler triple therapy (MITT) after a virus-associated COPD exacerbation.Methods. This was an observational prospective cohort study of COPD patients (spirographус criterion) hospitalized for AECOPD with viral (n = 60) or viral-bacterial (n = 60) infection. The comparison group included patients with bacterial AECOPD (n = 60). Viral infection was diagnosed by PCR-RT of sputum or bronchoalveolar lavage fluid for RNAs of rhinovirus, RS virus, influenza A and B viruses, or SARS-CoV-2 virus. Bacterial infection was demonstrated by sputum purulence and/or procalcitonin test results and/or standard culture data. During AECOPD, blood cytokines were measured by ELISA. The patients were treated with SITT (investigational treatment) or MITT (comparison treatment) of LAMA/LABA/ICS in real-world clinical practice. The follow-up started 4 weeks after AECOPD regression and discharge from hospital.Results. After 52 weeks of treatment, FEV1 decline was smaller than in the SITT group. Differences from the MITT group were greater in patients with viral AECOPD (–69 (–75; –10) ml vs –75 (–78; –72) ml) or viral-bacterial AECOPD (–67.5 (–69; –37.25) ml vs –75.5 (–84; –70.25) ml). An increase in DLCO/Va, 6-minut walk test (6MWT) results, a decrease in bronchodilation coefficient, blood eosinophils and fibrinogen was seen only in subjects who received SITT and had viralor viral-bacterial AECOPD. A multiple regression model revealed a direct association between blood interleukin-5 and improvement in FEV1 (В = 0.848) and DLCO/Va (B=0.117) and a negative correlation with blood levels of amino-terminal propeptide of type-III procollagen and improvement in DLCO/Va (В = –0.021).Conclusion. SITT with LAMA/LABA/ICS was more effective in preventing FEV1 decline, increasing DLCO, 6MWT results, and decreasing airway inflammation in virus-associated or viral-bacterial AECOPD.