Performance Characteristics for Physiological Measures of Progressive Pulmonary Fibrosis

Area of Science:

• Pulmonary Medicine
• Respiratory Research
• Clinical Trials

Background:

• Clinical measures for progressive pulmonary fibrosis (PPF) exist but their utility is not well-defined.
• Accurate assessment of PPF is crucial for patient management and treatment decisions.

Purpose of the Study:

• To evaluate the performance of lung function-based measures for identifying PPF.
• To compare new guideline criteria against established measures for predicting clinically relevant outcomes.

Main Methods:

• A multicenter retrospective cohort study analyzed data from 2727 patients with fibrotic interstitial lung disease (ILD).
• Eight categorical measures of forced vital capacity (FVC) and diffusion capacity (DLCO) decline were assessed.
• Performance was evaluated for discriminating two-year mortality or lung transplant, comparing stand-alone measures against PPF guideline criteria.

Main Results:

• Relative decline in FVC (≥10%) and DLCO (≥15%), along with PPF guideline criteria, showed the best test performance (AUC 0.67-0.68).
• All measures demonstrated higher specificity than sensitivity.
• Stand-alone relative decline measures offered similar clinical utility to PPF guideline criteria for informing treatment decisions.

Conclusions:

• Classifying PPF using stand-alone FVC and DLCO decline measures is clinically comparable to current PPF guideline criteria.
• Physiology-based PPF measures effectively discriminate outcomes with high specificity but limited sensitivity.