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Catheter ablation is a procedure in which a small catheter is placed inside the heart (via a leg vein). The catheter has a 4-8 mm metal tip through which radio-frequency (or cryothermal) energy is delivered to selected parts of the heart. (The area to ablate is selected primarily by two simple strategies: vector analysis of the how the arrhythmia activates the heart (ie…north-south, east-west) and secondly, by moving the ablation catheter in a “warmer-colder” trial-and-error manner.) The 4-8 mm ablation lesions can eliminate rogue cells that have electrically run amok, or in the case of AF, isolate areas of the heart.