Legend. Interventricular mechanical asynchrony in pulmonary hyptertension: 3-chamber (top), short-axis (middle) and short-axis tagged (bottom) images at aortic valve closure at trigger delay of 252 ms (left) and the time of peak right ventricular shortening at 341 ms (right). The maximal leftward septal bowing occurs after aortic valve closure at 341 ms, when tagging lines in the right ventricular free wall show further shortening (thick white arrows); left ventricular free wall shows relaxation. See page 753.