Abstract: A cardiac defibrillator employs first and second catheters, each of which have individual coils wound thereon which operate as a cathode in a defibrillating system. Each of the catheters are pliable enough and has a small enough diameter so that both of them can be perveneously placed through the tricuspid valve into the right ventricle of a patient's heart. Each of the catheters has a small screw at the distal end to permit affixing the catheter to different points in the wall of the septum. The defibrillating coils are entirely within the right ventricle and have a relationship relative to one another such that the defibrillating pulse delivered simultaneously to the two coils provides a field that creates effective defibrillation at a relatively low energy level such as five to fifteen joules.