Spirometry is not enough to diagnose COPD in epidemiological studies: a follow-up study

Area of Science:

• Pulmonary Medicine
• Epidemiology
• Diagnostic Accuracy

Background:

• Chronic obstructive pulmonary disease (COPD) diagnosis traditionally relies on spirometry, but its limitations necessitate further investigation.
• Previous epidemiological studies often base COPD diagnosis on spirometry and limited clinical data.
• Accurate diagnosis is crucial for effective patient management and public health strategies.

Purpose of the Study:

• To determine the diagnostic outcomes of airflow obstruction (AO) identified through a comprehensive work-up in a population-based study.
• To evaluate the consistency of spirometric findings and subsequent clinical diagnoses in individuals with initial AO.
• To establish the necessity of serial assessments and clinical evaluation for reliable COPD diagnosis.

Main Methods:

• Population-based cross-sectional study in North-Western Russia.
• Spirometry performed pre- and post-bronchodilator (BD) administration to identify airflow obstruction (AO).
• Clinical examination and repeat spirometry with BD testing by a pulmonologist for definitive diagnosis.

Main Results:

• Of 102 participants with post-BD AO initially, only 60.8% maintained AO upon re-examination, with final diagnoses including COPD (41), asthma (5), and asthma-COPD overlap syndrome (ACOS) (8).
• Among 65 participants with pre-BD AO, 23.1% showed post-BD AO at the second assessment, diagnosed with COPD (12), asthma (1), and ACOS (2).
• Significant variability in AO status and diagnostic outcomes highlights the need for repeated assessments.

Conclusions:

• Spirometry alone is insufficient for definitive COPD diagnosis.
• Serial spirometric assessments are essential for confirming persistent airflow obstruction.
• A comprehensive clinical evaluation is crucial to complement spirometry for accurate diagnosis in epidemiological studies.