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The Clinical Importance of Angle of Insonation with Respect to the Timing and Magnitude of Peak Systolic Mitral Annular Tissue Velocity

2008; Elsevier BV; Volume: 17; Linguagem: Inglês

10.1016/j.hlc.2008.05.093

1444-2892

Darryl P. Leong, Dennis Wong, Rishi Puri, Suchi Khurana, Stephen G. Worthley, Prashanthan Sanders,

Advanced MRI Techniques and Applications

Background and aims: Mitral annular tissue velocity imaging has been shown to be of value in the assessment of systolic left ventricular function (as measured by peak systolic mitral annular tissue velocity, Sm) and in the evaluation of cardiac synchrony (which has been assessed by measuring differences in time-to-peak systolic mitral annular velocity). In addition, it has been shown that at extremes of angles of insonation, tissue velocity-derived data may be inaccurate. It is unknown whether these inaccuracies result in clinically appreciable and significant differences in the estimation of Sm and time-to-Sm in routine cardiac imaging. Our aim was to measure the magnitude of change in Sm, and in the time-to-Sm, from standard apical windows to off-plane images in which the segment of interest moves parallel to the ultrasound beam.