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A 75-year-old man was referred for the treatment of a narrow QRS tachycardia. Electrophysiological
testing demonstrated that the narrow QRS tachycardia was an atrial tachycardia. Catheter
ablation of the tachycardia was performed using the Rhythmia mapping system (Boston
Scientific, Marlborough, MA). By mapping the superior vena cava (SVC) using a mini-electrode
basket catheter (Orion, Boston Scientific), a reentry circuit around the points traced
by Lumipoint algorithms (Boston Scientific) was demonstrated (Figure 1A and Online Supplemental Video 1). The activation map of the SVC encompassed 100% of the tachycardia cycle length.
Extrastimulus pacing in the vicinity of the highlighted points reset the tachycardia
with a postpacing interval identical to the tachycardia cycle length.
Figure 1A: Activation mapping of the tachycardia; B: Mapping during sinus rhythm.
