[COPD - Importance of Lung Function Testing for Diagnosis and Treatment]

Area of Science:

• Pulmonology
• Respiratory Medicine
• Diagnostic Imaging

Background:

• Chronic obstructive pulmonary disease (COPD) diagnosis and management rely heavily on pulmonary function testing.
• Current guidelines, such as the Global Lung Initiative (GLI) from the European Respiratory Society (ERS), emphasize spirometry for assessing airway obstruction.
• Lung hyperinflation and pulmonary emphysema can occur independently of airway obstruction, yet are part of the COPD disease complex.

Purpose of the Study:

• To highlight the importance of comprehensive pulmonary function testing in COPD management.
• To emphasize the role of lung function tests beyond spirometry in identifying key disease components.
• To discuss the implications of findings for treatment guidance, particularly non-pharmaceutical interventions.

Main Methods:

• Spirometry adherence to GLI/ERS reference values.
• Inclusion of full-body plethysmography for lung hyperinflation assessment.
• Determination of diffusion capacity for evaluating pulmonary emphysema.

Main Results:

• Lung hyperinflation and pulmonary emphysema can be present without detectable airway obstruction.
• These findings, though excluding formal COPD diagnosis by some criteria, are integral to the COPD disease spectrum.
• Absence of airway obstruction, a criterion in many clinical trials, necessitates alternative diagnostic and treatment guidance.

Conclusions:

• Comprehensive pulmonary function testing, including spirometry, plethysmography, and diffusion capacity, is essential for accurate COPD assessment.
• Even in the absence of airway obstruction, these tests guide critical non-pharmaceutical treatments like lung volume reduction and oxygen therapy.
• Accurate pulmonary diagnostics are vital for managing progressive COPD symptoms and guiding advanced therapies such as lung transplantation.