A catheter assembly includes a catheter body having a shaft portion and an arm portion, the arm portion having an adjustable defection in plane and out-of-plane relative to the shaft portion. An electrode disposed within the arm portion upon being energized is capable of ablating the entire cavo-tricuspid isthmus region of a heart without repositioning of the catheter body arm portion. An irrigation aperture located within the shaft portion of the catheter body supplies conductive biological fluid which acts as a virtual electrode for the ablation procedure.
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