Some rapid arrhythmias (tachycardia) may be resolved with catheter ablation.  An electrophysiology study will identify when this is possible, and where the abnormality occurs within the heart.  Tachycardia is often a result of an abnormal pathway, called a re-entry circuit.  When an electrical impulse enters the abnormal pathway, it continues to cycle, causing the heart to beat more frequently than it should. 

During catheter ablation, a long thin wire (catheter) with a specialized tip is inserted into the body and moved toward the heart.  The electrophysiologist uses a television monitor to place the catheter at the site of the abnormal pathway.  Then radio-frequency energy is passed through the catheter to heat the tip.  The heat causes a small scar, which interrupts the abnormal pathway and allows the heart to resume normal function.  This non-surgical procedure is approximately 90 percent effective, presents a low risk and little to no pain.