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Figure 5 Effect of Radiofrequency Ablation in the Same Patient as in Figures 3 and 4
(A) Radiofrequency energy delivery at the LA roof slows the tachycardia cycle length from 250 to 275 ms. Concomitantly, the P-wave morphology abruptly changes from upright to biphasic in lead V1
(arrows), indicating that the 2 loops converging at the roof have been eliminated. (B) Effect of radiofrequency energy delivery in the proximal CS. After entrainment mapping showed that the PPI at the proximal CS was still the same as the tachycardia cycle length, ablation at this site eliminated the last loop, resulting in sinus rhythm. There were no inducible tachycardias thereafter. Abl = ablation; other abbreviations as in Figure 4.
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