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Atrial fibrillation is often caused by rapidly discharging triggers, or "hot spots." In catheter ablation to treat atrial fibrillation, a doctor inserts long, thin tubes (catheters) into your groin and guides them through blood vessels to your heart. The electrodes at the tips of the catheters help your doctor determine where these triggers are located. Electrodes at the catheter tips can use radiofrequency energy, extreme cold (cryotherapy) or heat to destroy these triggers, scarring the tissue so that the erratic signals are normalized.