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To compare noninvasive estimates of pulmonary artery pressure (PAP) obtained via echocardiography (ECHO) to invasive measurements of PAP obtained during right heart catheterization (RHC) across a range of PAP. To examine the accuracy of estimating right atrial pressure via ECHO (RAP ECHO ) compared to RAP measured by RHC (RAP RHC ), and determine if adding RAP ECHO improves...