Asthma-COPD Overlap: What Are the Important Questions?

Area of Science:

• Pulmonology
• Respiratory Medicine
• Clinical Science

Background:

• Asthma-COPD overlap (ACO) is a complex respiratory condition presenting with features of both asthma and COPD.
• Diagnostic criteria for ACO are not universally standardized, leading to variable prevalence estimates (0.9%-11.1%).
• Patients with ACO experience a higher symptom burden, reduced quality of life, and more severe exacerbations compared to those with asthma or COPD alone.

Purpose of the Study:

• To review the current understanding of Asthma-COPD overlap (ACO).
• To highlight the challenges in diagnosis, pathophysiology, and treatment of ACO.
• To emphasize the need for further research in biomarker discovery and evidence-based therapies for ACO.

Main Methods:

• Literature review and synthesis of existing research on Asthma-COPD overlap.
• Analysis of diagnostic criteria, prevalence, and clinical characteristics of ACO.
• Examination of current evidence regarding the pathophysiology and treatment of ACO.

Main Results:

• ACO is characterized by persistent airflow limitation with overlapping asthma and COPD features.
• Potential diagnostic criteria include significant bronchodilator reversibility, asthma diagnosis, and smoking history.
• Pathogenesis may involve environmental exposures and genetic factors, with early-life influences playing a role.

Conclusions:

• ACO is a distinct clinical entity with significant morbidity, necessitating further investigation.
• Current treatment strategies for ACO are often extrapolated from asthma and COPD guidelines due to limited specific trial data.
• Urgent research is required to establish clear diagnostic biomarkers and evidence-based therapeutic options for ACO patients.