Author(s): Wise R.A.; Calverley P.M.A.; Carter K.; Clerisme-Beaty E.; Metzdorf N.; Anzueto A.
Source: International Journal of COPD; Feb 2018; vol. 13 ; p. 605-616
Publication Date: Feb 2018
Publication Type(s): Article
Available at International Journal of Chronic Obstructive Pulmonary Disease – from Europe PubMed Central – Open Access
Abstract:Background: Although COPD exacerbations are known to occur more frequently in winter, there is little information on hospitalizations and cause-specific mortality. This study aimed to examine seasonal variations in mortality and exacerbations in patients with COPD during the TIOtropium Safety and Performance In Respimat (TIOSPIR) trial. Patients and methods: TIOSPIR was a large-scale, multicenter trial, which assessed the safety and efficacy of tiotropium delivered via HandiHaler (18 mug once daily) or Respimat Soft MistTM (2.5 or 5 mug once daily) inhaler in patients with COPD. Patients were aged >=40 years, with a smoking history >=10 pack-years, and post-bronchodilator forced expiratory volume in 1 second <=70% and forced expiratory volume in 1 second/forced vital capacity <=0.70. COPD exacerbations and deaths were monitored throughout the trial. The data were pooled to examine seasonal patterns. Southern hemisphere data were shifted by 6 months to align with northern hemisphere seasons. Results: TIOSPIR was conducted in 43 northern (n=15,968) and 7 southern (n=1,148) hemisphere (n=1,148) countries. The median duration of treatment was 835 days, with a mean follow-up of 2.3 years. Among 19,494 exacerbations, there were clear seasonal differences (winter, 6,646 [34.1%]; spring, 4,515 [23.2%]; summer, 3,198 [16.4%]; autumn, 5,135 [26.3%]). Exacerbations peaked in early winter (December in the northern hemisphere and June in the southern hemisphere), respiratory hospitalizations in midwinter, and respiratory deaths in early spring. Conclusion: Although winter poses a 2-fold hazard for COPD exacerbations vs summer, respiratory deaths peak in early spring. These data suggest that seasonal intensification of preventive treatments may impact COPD morbidity and mortality. Trial registration number: NCT01126437.
Copyright © 2018 Wise et al.