Abstract: A primary central controller switch box for providing a centralized means for alternatively coupling a defibrillator, a plurality of pacers and recorders in conjunction with a quadripolar endocardial catheter, an apex and back body surface electrode, and an arterial or ventricular catheter having a means for selection therebetween. The switch box incorporates a plurality of switches allowing for manual selection of each of said instruments in predetermined combinations to eliminate the possibility of multiple support therapy and further decrease the time it takes to switch between instruments when used in a cardiac catheterization environment, electro physiological environment, cardiac resuscitation ward, ablation study, or the like clinical settings.