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Figure 2 Three examples in which the E-IDCs were recorded only during RVA pacing. Four ECG surface leads are recorded, along with intracardiac electrograms from the His area, RVA, and left ventricle (LV) during RVA pacing and SR. Notice that in the three examples, during RVA pacing, a small and late component separated by an isoelectric line appears. This component is not evident during SR.
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