Figure 1: ROC curve analysis of PRi- Pulmonary regurge index. PRi is defined as the ratio between duration of PR and duration of diastole. Using CMR RF % as the gold standard, PRi showed an AUC of 0.924, sensitivity of 86.36% specificity of 100% at cut-off value of 0.8 (This is the cut-off value between mild and more than mild degrees of PR).