Figure 2: Receiver operating characteristic (ROC) curves demonstrating the predictive accuracy of two novel parameters of differentiating RVOT from LVOT SOO. A: CoV – the greater the CoV the more likely the SOO is RVOT. A cut-off value of ≥ 0.7 (black circle) had a sensitivity of 78% and a specificity of 94% for predicting RVOT SOO (AUC 0.91). B: Lowest VE count of any hour. A cut-off of < 50 VE (black circle) in any hour was predictive of RVOT SOO with a sensitivity of 96% and specificity of 94%, (AUC 0.96). Dotted line represents reference line of a random test with no diagnostic accuracy.