Impact of the new ATS/ERS pulmonary function test interpretation guidelines

Area of Science:

• Pulmonary Medicine
• Diagnostic Criteria
• Respiratory Physiology

Background:

• Joint statement by American Thoracic Society and European Respiratory Society in 2005 proposed new pulmonary function test interpretation.
• The real-world impact of adopting these new guidelines remains unstudied.

Purpose of the Study:

• To evaluate the effect of the new interpretation strategy on obstructive and restrictive diagnoses.
• To compare diagnostic distributions using different interpretation schemes.

Main Methods:

• Analysis of pulmonary function tests from 319 patients using four interpretation schemes.
• Comparison of patient classifications (obstructed, restricted, neither, both) across schemes.
• Examination of factors influencing classification changes.

Main Results:

• Similar proportions of patients identified as restricted (23% GOLD vs. 22% new).
• Significantly more patients diagnosed with obstruction using the new scheme (44% vs. 33%, P<0.005).
• 36% of obstructed patients experienced a classification change; women were more likely to change.

Conclusions:

• The new interpretation scheme results in a higher proportion of obstruction diagnoses.
• Clinical significance and economic impact of the new scheme require further validation.