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Distinguishing Asthma and COPD in Primary Care: A Case-based Approach
T Aaron Zeller1, Katherine Beben1, Stephanie Walker1
1University of South Carolina School of Medicine-Greenville, Greenville, South Carolina.
American Family Physician
|March 15, 2023
Summary
Differentiating asthma and chronic obstructive pulmonary disease (COPD) can be challenging. Spirometry is key for diagnosis, with asthma showing reversible obstruction and COPD showing persistent airflow limitation, though overlap exists.
Area of Science:
- Pulmonary Medicine
- Respiratory Diseases
Background:
- Asthma and COPD are prevalent respiratory conditions affecting millions, incurring significant healthcare costs and mortality.
- Accurate differentiation between asthma and COPD is clinically challenging but crucial for effective management.
Purpose of the Study:
- To clarify diagnostic criteria for asthma and COPD using spirometry.
- To describe the clinical utility of recognizing asthma-COPD overlap.
- To provide guidance on treatment strategies for asthma-COPD overlap.
Main Methods:
- Spirometry to assess airflow obstruction and reversibility.
- Methacholine challenge testing to evaluate airway hyperresponsiveness.
- Review of diagnostic patterns and established treatment guidelines.
Main Results:
- Asthma diagnosis relies on reversible airflow obstruction (FEV1 improvement >12% and >200 mL) or bronchoconstriction.
- COPD diagnosis is based on persistent, irreversible airflow obstruction (FEV1/FVC <70%).
- Asthma-COPD overlap presents with spirometric reversibility and persistent baseline airflow limitation.
Conclusions:
- Accurate spirometry is essential for distinguishing asthma from COPD.
- Asthma-COPD overlap is a clinically relevant phenotype requiring tailored treatment.
- Treatment for asthma-COPD overlap should integrate asthma and COPD management principles.
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