RESUMEN
INTRODUCTION: Severe exacerbations in chronic obstructive pulmonary disease (COPD) may require acute medical attention by calling the emergency medical services (EMS) for an ambulance. The 30-day mortality for EMS patients with respiratory diseases appears to have stagnated, which may be due to changes in age, comorbidity or disease severity. We examined trends of occurrence, severity and mortality for EMS patients with COPD. METHODS: A historical population-based cohort study was conducted encompassing patients with COPD who requested an ambulance in the North Denmark Region in the 2007-2018 period. We described acute severity by oxygen saturation and respiratory rate at the arrival of the ambulance along with comorbidity and duration of hospitalisation. RESULTS: A total of 5,969 EMS patients with COPD were identified and the figure nearly doubled from 2007 to 2018. Age and comorbidity were higher in the last part of the period. Furthermore, the initial respiratory rate was higher, oxygen saturation was lower and the duration of hospitalisation was lower in the last part of the period. The 30-day mortality rose from 12.6% to 15.4%, but the odds ratio was not statistically higher and decreased after adjustment. CONCLUSIONS: COPD constituted increasing proportions of those admitted to hospital after calling the EMS. The mortality among EMS patients with COPD may be due to patients being older, having more comorbidities or being more severely acutely ill. The mortality suggests that COPD patients requesting an ambulance should be considered severely ill. FUNDING: none. TRIAL REGISTRATION: not relevant.