Figure 3 Activation map during SR and AT
The left panels show the activation map during SR of the RA in the RAO
(A) and PA (C) views. The total activation window was divided into 15
isochronal zones, from red to purple. The wavefront propagation extended
from the SN in three directions. Pathway 1 propagates superiorly with
conduction delay at the superior edge of the incision line. Pathway 2
also propagates posteriorly from the SN. Subsequently, Pathway 1 and 2
collided at the RA posterior wall and propagated to the anteroseptal
wall after the turn at the septal end of the linear LGE. Pathway 3
propagates caudally along the linear LGE and slowly turns around the
edge of the linear LGE. Pathways 2 and 3 collided with the low lateral
RA. The conduction velocities at each site during SR were 136 mm/s in
Area A, 467 mm/s in Area B, 398 mm/s in Area D, and 527 mm/s at the site
without LGE.
The right panels show the activation map during AT of the RA in the RAO
(B) and PA (D) views. The activation map demonstrated that the
activation propagated clockwise around the long linear LGE. The total
activation window was also divided into 15 isochronal zones. Pathway 1
showed slow conduction at the upper edge of the incision line during AT,
conducted superiorly, and then collided with Pathway 2. Pathway 2 was
the main circuit during AT, which was conducted posteriorly through the
sinus venosa. Subsequently, it propagated to the anteroseptal wall after
the turn at the septal end of the LGE. The conduction velocities at each
site during AT were 116 mm/s in Area A, 985 mm/s in Area B, and 520 mm/s
in Area D, and 1257 mm/s at the site without LGE.
SR = sinus rhythm; AT = atrial tachycardia; RA = right atrial; RAO =
right anterior oblique; PA = posterior-anterior; SN = sinus node; LGE =
late-gadolinium enhancement
REFERENCES