Echocardiographic Variables:
Table 2 shows the echocardiographic variables of the subgroups.
The right ventricular systolic pressure was 30.97 +/- 9.27, 36.72 +/-
14.50, and 48.12 +/- 13.92, respectively, in normal, moderately reduced,
and severely reduced EF patients (p<0.0001). Reproducibility
of inter-observer variabilities was calculated for all the four
variables, Sā, TAPSE, RV FAC, and lateral RV free wall strain. There was
a significant difference in the parameters assessed for RV systolic
function (Table 2) . There was a linear association with the MRI
reference parameter of RVEF with RVEF <45% and RVEF
< 30% for all the variables, with strain having the most
significant association (Figure 2 and Figure 3 ). Other
parameters like LV mass index, LV end-diastolic mass, and LV
end-diastolic mass indices also significantly differed among the groups.
ROC curves with cutoffs of RVEF<45%, and RVEF ⤠30% are
shown in Figure 4 estimating the accuracy of echocardiographic
parameters to predict RV function. The echocardiographic parameter that
most accurately assessed the RV systolic function was RV lateral free
wall strain and the area under the curve (AUC) for ROC was 0.69 (95% CI
0.63 ā 0.75) and 0.78 (95% CI 0.70 ā 0.88) in the groups B and C
respectively (Table 3) . RV FAC % ranked second in the accuracy
of predicting RV systolic function among the TTE parameters in both
groups.