Impact of non-invasive ventilation on exacerbation frequency in COPD patients

INTRODUCTION Acute exacerbations of COPD are key events in the natural course of the patient's illness, as they significantly impair the health condition, accelerate the deterioration of lung function, worsen the prognosis for the patient and account for the majority of the COPD-related healthcare costs. Particularly in patients with a pre-existing non-invasive ventilation (NIV) therapy, a reduction of exacerbation frequency is crucial, as they are at high risk for a lasting morbidity and increased mortality. METHODS A prospective cohort study was conducted. Data from adult patients with COPD diagnosis and existing High-Intensity NIV (HINIV) therapy from August 2021 to September 2023, were used. Exacerbation history of moderate and severe exacerbations of the past 12 months and blood gases at initiation and during HINIV therapy, were analyzed. RESULTS A total of 20 patients were included in the study (mean age 69.2 +/- 9.0 years; 70% female). After initiation of HINIV therapy the frequency of exacerbation showed a significant reduction from 1.5 +/- 0.9 to 0.5 +/- 0.5 per year (p<0.001). In addition, improvements in pCO(2) (73.0 +/- 22.0 mmHg vs 44.0 +/- 4.8 mmHg, p<0.001), the pH (7.33 +/- 0.1 vs 7.42 +/- 0.0, p<0.001) and HCO3- (33.0 +/- 4.9 mmol/L vs 27.9 +/- 3.2 mmol/L, p<0.001), were successfully demonstrated. CONCLUSIONS The present study demonstrates the positive effects of highintensity NIV on COPD exacerbation rate, measured by the number of moderate and severe exacerbations in one year. Most significant effects were observed when patients had a high number of exacerbations before the initiation of NIV therapy.