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Figure 4 Linear regression analysis between PVR_CATH and TRV/TVI_RVOT. The correlation remained robust among all groups of patients. Patients with normal left atrial pressure (LAP) and right atrial pressure (RAP) (open squares), elevated LAP and RAP (solid squares), elevated LAP and normal RAP (solid triangles), and elevated RAP and normal LAP (open triangles) were evenly distributed among the study population. Abbreviations as in Figure 1.