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Linear regression of right atrial pressure (RAP) and pulmonary artery (PA) capacitance index (A), PA elastance index (B), total pulmonary resistance (C), and left ventricular transmural pressure (LVTMP) (D). Note that increase in PA elastance index and total pulmonary resistance denote increase in right ventricular (RV) afterload, whereas decrease in PA compliance denotes a decrease in RV afterload.
