Figure 2.

 A patient with left ventricular mechanical dyssynchrony in multiple segments before (panels A, C, E) and after (panels B, D, F) CRT. Before CRT, the apical four chamber view (A) shows only mild delay of basal lateral segment over the basal septal segment of 30 ms. In the apical two chamber view (C), there was severe delay in the basal inferior wall over the basal anterior wall of 130 ms which was significantly improved after CRT (D). In the apical long axis view (E), the basal posterior wall was delayed over the basal anteroseptal wall of 90 ms which was totally abolished after CRT (F). The peak systolic velocity during the ejection phase in each view are shown by the arrows.