Abstract
Early diastolic mitral annular velocities (E') are routinely generated by tissue Doppler imaging (TDI), an angle-dependent technique. Velocity vector imaging (VVI) lacks this limitation. Normal VVI E' values and their correlation with TDI E' are unknown. E' by VVI and TDI were compared in 100 patients. VVI velocities are lower and correlate moderately with TDI velocities for medial E' (r = 0.405) and mildly for lateral E' (r = 0.278) and are image quality dependent. In patients with diastolic or systolic dysfunction, no correlation was found. E' < 0.06 m/s by VVI for the medial and lateral annulus can detect abnormal diastolic function with sensitivity of 90% and 77%, respectively, and with specificity of 56% and 52%, respectively. E' by VVI is lower than by TDI with a poor agreement between the measurements, which are therefore not interchangeable. Although VVI can be performed offline, this method is dependent on image quality.
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