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Figure 2 Electrocardiogram during left ventricular (LV) pacing, showing fusion at AV1 but not at AV2, AV3, and AV4. From the electrocardiographic leads I, II, III, aVR, aVL, aVF, and V1 are displayed together with telemetered right ventricular (RV) electrogram (EGM). Notice the change in the morphology of the RV EGM when fusion is lost completely; see also Figure 3.
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