Left ventricular twist, but not circumferential-longitudinal shear angle, increases with increasing age in normal subjects
نویسندگان
چکیده
Background Left Ventricular (LV) twist, defined as the difference in rotation between the apex and the base, has recently been suggested as a diagnostic imaging biomarker for LV dysfunction [1]. Increasing age is associated with an increase in apical rotation, which leads to an increase LV twist [2-4]. Recently, it has been suggested that LV circumferential-longitudinal shear angle (CL-shear angle) [5] may be a more robust imaging biomarker than LV twist, due to normalization within the formula for ventricular size and slice separation [6]. However, changes in CL-shear angle with respect to age have not been reported. CL-shear angle is defined as the difference between apical rotation times the epicardial radius of the apex and basal rotation times the epicardial radius of the base, divided by the distance between the apex and base. The purpose of this study was to evaluate age related changes in CL-shear angle.
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Left ventricular twist and shear-angle in patients with mitral regurgitation
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