The Cardioversion I System is fully integratable with connector cabling, switchbox, and a catheter. This switchbox links the capabilities of diagnostics and defibrillation which makes it dual-purpose. It is able to combine two different capabilities. Users can easily switch back and forth between the cardioversion mode and the diagnostic EP procedures with one simple switch. For treating Supraventricular Tachycardia this system is useful in diagnostic electrophysiology studies and internal cardioversion methods. It comes in a variety of curve configurations. The linear energy transfer optimizes catheter electrode spacing. With varied electrode spacing the catheter designs are steerable and fixed. This system is perfect to help physicians and technicans to do their job thoroughly and efficiently.