Fig. 5.

Rotational movement of the heart base in a clockwise direction as well as apical rotation in the opposite direction are observed during contraction from the side of the LV apex. STE allows for quantitative and qualitative tracking of the parameters of this movement. Parasternal transverse view shows the left ventricle at the level of mitral valve. The ROI was delineated according to the same principles. The red color indicates clockwise rotational movement, whereas the blue indicates the opposite direction (arrows). The two intersecting lines represent axes delineating the horizontal and vertical direction at the onset of the cardiac cycle; their rotation illustrates the rotation of the whole left ventricle around the long axis. The image was captured in the late systolic phase, hence the red color and axis deviation to the right (clockwise)