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Increased stiffness of the pulmonary vascular bed is known to increase mortality in patients with pulmonary arterial hypertension (PAH); and pulmonary artery (PA) stiffness is also thought to be associated with exercise capacity. The purpose of the present study was to investigate whether cardiac magnetic resonance imaging (CMRI)-derived PA distensibility index correlates with PA stiffness estimated on right heart catheterization (RHC) and predicts functional capacity (FC) in patients with PAH.

circulation journal

Cardiac Magnetic Resonance Imaging-Derived Pulmonary Artery Distensibility Index Correlates With Pulmonary Artery Stiffness and Predicts Functional Capacity in Patients With Pulmonary Arterial Hypertension