Case fatality of COPD exacerbations: a meta-analysis and statistical modelling approach

Area of Science:

• Pulmonary Medicine
• Epidemiology
• Critical Care

Background:

• Severe exacerbations are a major cause of mortality in patients with chronic obstructive pulmonary disease (COPD).
• Long-term survival data following severe COPD exacerbations are crucial for understanding disease burden.

Purpose of the Study:

• To estimate the long-term case fatality rate associated with severe chronic obstructive pulmonary disease (COPD) exacerbations requiring hospitalization.
• To quantify the excess mortality attributable to severe COPD exacerbations using literature data.

Main Methods:

• A systematic literature search identified studies reporting survival data for at least 1.5 years post-hospitalization for severe COPD exacerbations.
• Survival curves were analyzed to distinguish critical and stable periods, with mortality estimated by backward extrapolation.
• A random-effects meta-analysis was performed on data from six eligible studies.

Main Results:

• The meta-analysis yielded a weighted average case fatality rate of 15.6% (95% CI 10.9-20.3) for severe COPD exacerbations.
• Individual study estimates ranged from 11.4% to 19.0%.
• Severe exacerbations increase mortality risk both during hospitalization and in the post-discharge period, contributing substantially to overall COPD mortality.

Conclusions:

• Severe COPD exacerbations requiring hospitalization have a substantial long-term case fatality rate.
• These events significantly impact patient survival beyond the acute hospitalization phase.
• Understanding and mitigating the long-term mortality from severe COPD exacerbations is critical for patient management and public health.