 This study found that patients with severe pulmonary hypertension, pH, regardless of the underlying cause, have lower small pulmonary vessel volume compared to those with mild to moderate pH. Additionally, these patients also have a higher risk of death. This suggests that the presence of pH may be indicative of more advanced disease and could potentially serve as a marker for remodeling of the distal pulmonary vasculature. Further studies are needed to confirm this hypothesis. This article was authored by Daya Al-Kamfa, Yasef Shahin, Faisal Al-Andarjani, and others.