FIGURE LEGENDS
Figure 1(A) Intracardiac electrogram during the tachycardia with the earliest atrial activation at the His bundle region. (B) Intracardiac electrogram during the tachycardia with 2:1 atrioventricular conduction. I, II, V1 = surface electrogram; HRA d and HRS p= distal and proximal high right atrium; His d and His p = distal and proximal His bundle region; CS d and CS p = distal and proximal coronary sinus; RV d and RV p = distal and proximal right ventricle; H = His bundle electrogram.Figure 2Intracardiac electrograms during ventricular burst pacing at a pacing cycle length of 360ms during the tachycardia with a cycle length of 390ms.
With an early timing.
With a delayed timing.
The numbers indicate the cycle lengths in ms. VP = ventricular pacing. The other abbreviations are as in Figure 1.Figure 3
Intracardiac electrogram at a successful ablation site. Radiofrequency ablation in the noncoronary aortic cusp of Valsalva just superior to the His bundle region terminated the tachycardia.
(B) Fluoroscopy image at a successful ablation site.
ABL = ablation catheter. The other abbreviations are as in Figure 1.