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Figure 6 Demonstration of concealed entrainment at a site remote from the Purkinje system. (A) Electrogram during sinus rhythm without Purkinje potentials. (B) Mid-diastolic isolated potential at this site during ventricular tachycardia (VT). The electrogram-QRS interval measured from the isolated potential is 160 ms. (C) Entrainment mapping performed at this site shows a matching stimulus-QRS interval of 160 ms during concealed entrainment. The catheter moved and ablation was not attempted at this site. This VT was ablated at a site displaying Purkinje potentials during both VT and sinus rhythm.
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