Cardiac catheter ablation is a minimally-invasive procedure performed to treat heart rhythm disorders. Radiofrequency energy (heat), a laser or nitrous oxide (extreme cold) is applied through the catheter tip to the abnormal heart tissue. The energy destroys (ablates) the abnormal heart tissue causing the heart rhythm disorder. Catheter ablation is performed by electrophysiologists. Several types of catheter ablation may be performed, depending on the cause and severity of the patient's heart rhythm disorder. Many types of heart rhythm disorders may be treated successfully by catheter ablation.