Figure 4: QDOT MICROTM Catheter for ablation of
atrial tachycardia by QMODE+
A: Electroanatomic map of the left atrium utilizing CARTO 3, V7
(Biosense Webster). Left side, left anterior oblique, LAO) view. A local
activation time map with evidence of a peri-mitral atrial tachycardia,
suggesting the critical isthmus at the anterior wall. Coppery area –
zone of slow or no conduction (Coherent module, Biosense Webster).
B: voltage map with evidence of a large scar area on the anterior and
posterior wall. The bipolar voltage reference interval was set between
0.05 mV and 0.35 mV.
C: QDOT MICROTM Catheter in QMODE+ and ablation at the
anterior wall at the moment of atrial tachycardia termination Left side,
right anterior oblique (RAO) view; right side, LAO view. Note the
ablation catheter in the anterior wall during delivery of a very
high-power short-duration application of 90 W/4 s. The contact force was
18 g and the distance from the previous application was 5.3 mm. The
“bullseye” in the left upper corner indicates the temperature of the
ablation catheter tip.
D: Final lesion set up with an anterior line depicted by red dots with
white points.