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before the responsible tissue is eliminated. Radiofrequency ablation technique can be used in AF, either to block the atrioventricular node after implantation of a pacemaker or to block conduction within the left atrium, especially around the pulmonary veins. Radiofrequency ablation for AF can be unipolar (one electrode) or bipolar (two electrodes). Although bipolar can be more successful, it is technically more difficult,

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