RESULTS: RHC identified 66/123 (54%) patients with PAH. The noninvasive cut-point was: estimated right ventricular systolic pressure (RVSP) > 36.5 mm Hg by D-ECHO. D-ECHO classified 107 subjects correctly (59/66 with and 48/57 without PH; sensitivity 89.4%, specificity 84.2%). The area under receiver-operating characteristic curve (AUC) was 0.96 for D-ECHO. A positive significant correlation (r=0.853, P<0.01) was found between RVSP measured by D-ECHO and systolic pulmonary arterial pressure (sPAP) measured by RHC. Similar positive significant correlation (r=0.790, P<0.01) was also found between RVSP measured by D-ECHO and mean pulmonary arterial pressure (mPAP) measured by RHC. In addition, D-ECHO showed higher RVSP, left ventricular internal diameter (LV), right atrial diameter (RA), right ventricular internal diameter (RV), left ventricular end-diastolic diameter (EDD), left ventricular diastolic end-diastolic volume (EDV) and mitral velocity A wave (AMV) values in the PAH-CHD group than in the CHD group (P<0.05).