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Figure 4 Receiver-Operating Characteristic Curve Analysis of Longitudinal and Torsional LV Mechanics

Receiver-operating characteristic curves of E_m, E_r, and net LV twist (T) have been plotted for differentiating CP from RCM. Optimal cut-off value for E_m was 5 cm/s (92% sensitivity and 90% specificity); E_r was –50°/s (57% sensitivity and 95% specificity); and net LV twist was 10° (83% sensitivity and 84% specificity). The area under the receiver-operating characteristic curve was significantly higher for early diastolic longitudinal velocities as compared with early diastolic untwisting velocities (p = 0.01). Abbreviations as in Figures 1 to 3.