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Your heart has a "natural pacemaker", consisting of small areas which stimulate the electrical current that makes it beat, and when these areas don't work correctly, it can cause a dangerously low or fast heart rate. Electrophysiology treatments can restore this, though the type(s) you'll need depends on your arrhythmia.
If you have severe arrhythmia, your physician may decide you need a pacemaker and/or an implantable cardioverter defibrillator (ICD). This small, electronic device "watches" your heart to ensure it isn't beating too slow or fast. When too slow, the pacemaker will produce an impulse to make it beat at a higher rate; when too fast, the ICD delivers a shock to slow your heart to a more normal rate.
These treatments are usually recommended for less severe arrhythmia. During a cardioversion treatment, your cardiologist places electrodes on your chest and uses electrical shocks to try and restore the normal rhythm of the heart. Radiofrequency ablation involves insertion of an electrode catheter into a large vein or artery which maps the source of irregular impulses, then sends high frequency radio waves to destroy the troublesome cells.