Hui W, et al. - The correlation between apical transverse motion (ATM) and ventricular function in children with dilated cardiomyopathy (DCM) was determined. ATM was analyzed visually and by speckle-tracking longitudinal displacement of the interventricular septal and left ventricular (LV) lateral walls in opposite directions using echocardiography. It was observed that 45% of patients had ATM (interventricular septum displacing toward the lateral wall and lateral wall displacing toward the mitral annulus during systole). Reverse ATM (r-ATM; lateral wall displaced toward the apex and interventricular septum displaced toward the septal annulus during systole) was illustrated by 18% of individuals. ATM was related to LV dysfunction, mechanical inefficiency, and interventricular mechanical delay in pediatric DCM.