Rising stars of DPLD survival: FVC and exercise desaturation (a single-center study)

Area of Science:

• Pulmonology
• Cardiopulmonary Medicine
• Fibrotic Lung Diseases

Background:

• Diffuse parenchymal lung diseases (DPLDs) represent a diverse group of conditions.
• These diseases often lead to irreversible lung fibrosis.
• Understanding factors influencing survival in DPLDs is critical.

Purpose of the Study:

• To investigate the impact of physiological and functional parameters on survival in DPLDs.
• To examine the relationship between pulmonary hypertension (PH) and survival in DPLD patients.
• To identify key predictors of mortality in this patient population.

Main Methods:

• Retrospective analysis of data from 158 patients diagnosed with DPLDs.
• Patients categorized into five diagnostic groups: IPF, non-IPF interstitial pneumonias, connective tissue diseases, sarcoidosis, and other DPLDs.
• Survival status determined via phone calls.

Main Results:

• Median survival observed was 42.9 months.
• Significant negative predictors of survival included older age, delta saturation (DeltaSat), reduced 6-minute walking distance, elevated systolic pulmonary artery pressure (sPAP ≥50 mmHg), and lower diffusing capacity for carbon monoxide (<80%).
• Higher DeltaSat (>10%) strongly correlated with sPAP (>50 mmHg), indicating worse survival.

Conclusions:

• Forced vital capacity percentage (FVC%) is a significant predictor of mortality in DPLDs.
• A strong association exists between exercise-induced desaturation and pulmonary hypertension.
• These findings highlight the importance of monitoring FVC% and assessing for PH in DPLD management.