Inappropriate Peak Inspiratory Flow Rate in the Patients with Stable Chronic Obstructive Pulmonary Disease in Korea.

Background: While inhalation therapy efficacy hinges on attaining proper peak inspiratory flow rate (PIFR), the prevalence of inappropriate PIFR among patients with chronic obstructive pulmonary disease (COPD) remains unstudied in Korea. This study aimed to assess the prevalence of inappropriate PIFR, its correlation with COPD assessment test (CAT) scores, and factors associated with suboptimal PIFR.

Methods: We enrolled 108 patients with COPD who had been using the same inhaler for at least 1 year without exacerbations.