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. 2018 Sep 18;5:123. doi: 10.3389/fcvm.2018.00123

Figure 2.

Figure 2

12 lead ECG with associated endocardial electrograms of a PVC arising from the posterior Purkinje network. Purkinje fascicular potentials precede QRS onset by 18 ms during sinus rhythm. During the PVC, Purkinje potentials precede QRS onset by 108 ms (blue arrows). Notice the presence of a concealed Purkinje potential (red arrow).