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Figure 5.17. CRT with single LV electrode pacing. Isochrone maps during LV pacing only show
fusion beats with native RV activation. (A) LV paced activation sequence without fusion. (B-D)
Fusion beats with progressively earlier intrinsic RV activation (time of RV breakthrough) relative
to LV pacing as a consequence of increasing atrial-LV delay (AVD; indicated in each panel). Earlier
intrinsic RV activation results in greater degree of fusion and greater synchrony, until excellent
synchrony is achieved in (D) with LV pacing only. From Jia et. al. [304] with permission of Elsevier.