Figure 1

Longitudinal contribution (top) with lateral and septal movement demonstrated (bottom) in end diastole (ED) and in end systole (ES). The longitudinal function, calculated from the atrioventricular plane displacement (AVPD) is demonstrated in 4 chamber view. The volume derived from the AVPD is the area between the full and dashed outline of the AVPD. The lateral and septal movement is demonstrated in short axis view. The volume derived from the lateral movement is the area between the full and dashed outline of the outer delineation. The right ventricular insertion points are marked with double circles. The faint colored areas are the septal contribution to stroke volume, in this case moving to the left in systole