Prognostic factors in interstitial lung disease-associated pulmonary hypertension: data from the HYPID cohort and the French Pulmonary Hypertension Registry

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BACKGROUND: Pulmonary hypertension (PH) frequently complicates interstitial lung diseases (ILDs), adversely affecting outcome. Identifying prognostic factors of patients with PH associated with ILD (ILD-PH) could facilitate early identification of patients who may benefit from PH therapy. METHODS: We included patients with ILD-PH from the prospective HYPID cohort and the French National Pulmonary Hypertension Registry (2007-2022). Univariable and multivariable analyses were performed to identify predictors of 1-year mortality. RESULTS: A total of 581 patients (mean age 69.4±9.3 years; 450 males) were analysed. ILD diagnoses were combined pulmonary fibrosis and emphysema (CPFE) syndrome (30.8%), idiopathic pulmonary fibrosis (29.6%), unclassifiable ILD (13.1%) and fibrotic hypersensitivity pneumonitis (10.3%). Mean pulmonary arterial pressure was 40.7±9.1 mmHg and mean pulmonary vascular resistance (PVR) was 7.6±3.5 Wood units (WU). Off-label PH therapy was initiated after initial evaluation in 215 patients (37%). The median transplant-free survival time was 17 (95% CI 15.2-not reached) months. Multivariable analysis identified male sex (p<0.001), World Health Organization functional class (WHO FC) III (p=0.003) or IV (p=0.003), 6-min walk distance (6MWD) ≤228 m (p<0.001), PVR >5 WU (p=0.008) and absence of PH therapy (p<0.001) as independent predictors of death or lung transplantation at 1 year. CONCLUSION: Non-invasive (6MWD and WHO FC) and invasive (PVR) variables are associated with prognosis in patients with ILD-PH, including in patients with CPFE. PH medication might improve outcomes in this patient population.

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