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Figure 4 Entrainment Mapping in the Same Patient as in Figure 3
(A) The post-pacing interval (PPI) from the ostial aspect of the coronary sinus (CS) is 250 ms, matching the tachycardia cycle length. (B) Entrainment mapping from the distal CS also shows a perfect return cycle. (C) Entrainment mapping from the distal CS after radiofrequency ablation (RFA). Despite a lack of change in the P-wave morphology or the tachycardia cycle length, a long PPI implies that the mitral/distal CS portion of the AT circuit has been eliminated. Also shown are electrocardiographic leads II, V1, and V5, and bipolar electrograms recorded by catheters placed in the left atrium (LAd and LAp) and right atrium (RAd and RAp). Os = ostium.
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