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).