3.1 Clinical characteristics according to pressure-dimension index tertiles
Clinical and laboratory characteristics of patients within the three PDI groups were summarized in Table 1. The only remarkable difference between groups in terms of clinical and demographic variables was that the number of patients with an ischemic cardiomyopathy was significantly higher in the second tertile. As expected, RVMD and PASP on echocardiography were significantly different between groups, although catheter-measured mean pulmonary artery pressure did not differ among groups. Instead, right atrial pressure (RAP) and pulmonary vascular resistance (PVR) were significantly different, with the former being lowest and the latter being highest in the third tertile (Table 2).