Figure 11

Strain maps in the apical 4 chamber view at LV pre-excitation of 20 ms (A) and right ventricular pre-excitation of 20 ms (B). Note improvements in strain velocities from an average of 15 cm/s during LV pre-excitation to an average of 20 cm/s during right ventricular pre-excitation. In addition improved synchrony is also seen in the basal LV and right ventricular segments. Yellow line represent basal right ventricle, blue represents basal inferior interventricular septum and red represents basal lateral segment.