Background--Accurate noninvasive diagnostic tools for evaluating left ventricular (LV) diastolic dysfunction (LVDD) are limited in preserved LV ejection fraction. We previously proposed the relationship of normalized rate of change in LV torsion shear angle (φ 0 ) to corresponding rate of change in LV volume (V 0 ) during early diastole (represented as Àdφ 0 /dV 0 ) as a measure of LV diastolic function. We prospectively evaluated diagnostic accuracy of Àdφ 0 /dV 0 in respect to invasive LV parameters.

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