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The article focuses on percutaneous cardiac mapping and ablation registry. After the first published reports of therapeutic electrode catheter ablation appeared in 1982, the Percutaneous Cardiac Mapping and Ablation Registry was formed to collect and disseminate information relative to these nonpharmacological techniques for control of refractory cardiac tachyarrhythmias. Thus, the Registry allows physicians to assess the risks and benefits of these procedures. Because this field is evolving, it was considered important to devise a central registry for tracking the course of not only catheter electrode ablation techniques but also those catheter techniques using alternative forms of energy.