ECV in CRT pts was safe and effective in this two-center study. A transient increase in LV lead pacing threshold was observed. Relevant changes in pacing threshold at FU occurred in five LV leads-identification and regular FU of these pts are necessary. Restoring SR through ECV significantly increased the biventricular pacing percentage but arrhythmia recurrence was frequent. CRT pts with atrial arrhythmias require close FU after ECV.

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