A heart rhythm problem (arrhythmia) can make your heart beat too fast or in an irregular pattern. The problem is often caused by cells in your heart that aren’t working as they should. Or, it may be the result of an abnormal electric circuit. It may cause bothersome symptoms, such as an irregular heartbeat, dizziness, shortness of breath, chest pain, or fainting. Your doctor has recommended catheter ablation to treat your arrhythmia. This non-surgical procedure destroys the cells that are causing the problem.