Click on image to view larger version.

Figure 2 Assessment of Regional Left Atrial Velocity by Tissue Doppler Imaging at Apical 4-Chamber View

The sampling window was placed at the midatrial level. In a responder of left ventricular reverse remodeling, there was improvement of atrial contraction velocity (arrows) when compared between baseline (A) and 3 months after cardiac resynchronization therapy (B). On the other hand, the nonresponder showed no improvement of atrial contraction velocity (arrows) between baseline (C) and 3-month follow-up (D).