3.2 Correlation of pressure-dimension index with echocardiographic and catheterization parameters
As expected, PDI had significant correlations with right ventricular end-diastolic diameter (p<0.001, r=-0.626) and echocardiographic systolic pulmonary pressure (p=0.001, r=0.442). No other echocardiographic parameter correlated with PDI, including visual assessment of RV and tricuspid regurgitation velocity. Of catheterization parameters, PDI had shown a significant correlation with RAP (r=-0.402, p=0.007), RAP/wedge pressure ratio (r=-0.369, p=0.014) and PVR (r=0.447, p=0.002) (Figure 2). To note, the association between PDI and PVR was in part related to the correlation between PASP and PVR (r=0.297, p=0.05).