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Tissue ablation radiofrequency therapy systems designed to ablate (i.e., produce a therapeutic lesion) regions of endocardial tissue that give rise to or support cardiac arrhythmia. These systems typically consist of a radiofrequency generator (frequencies below 500 kHz are usual), a multipolar catheter 2 to 4 mm long with distal surface or needle-like electrodes, and a neutral electrode that is placed on the body surface. Some systems include thermocouples at the tip of the electrodes for temperature-controlled mode capability.
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