Please click here to obtain permission to reproduce this image.
Click on image to view larger version.
Figure 3 (A) Isopotential maps showing the activation sequence (frames 1 to 6) of clockwise upper loop re-entry in the right posterior oblique view. Color scale for each isopotential map has been set so that white indicates most negative potential and blue indicates least negative potential. The activation wavefront propagates backward and downward from the superior anteromedial right atrium (RA) near the RA appendage (frame 1) to the middle posterior RA (frame 2), then splits into two wavefronts; one passes close to the crista terminalis (CT) (frame 3), and the other passes through the septal RA (it is not shown in the figure). The wavefront in the posterior RA continues through the gap (g) in the CT (frame 4) to the lateral RA and around the area of functional block (frame 5), then activates the anterolateral RA (frame 6) before reactivation of the superior anteromedial RA once again. (B) The virtual electrograms from the CT (11 to 14) and the area of functional block (15 to 19) demonstrate double potentials. The numbers 1 to 6 represent the time points at which the isopotential maps have been displayed in A. IVC = inferior vena cava; SVC = superior vena cava.
|
