A system and method of providing composite real-time dynamic imagery of a medical procedure site from multiple modalities which continuously and immediately depicts the current state and condition of the medical procedure site synchronously with respect to each modality and without undue latency is disclosed. Ventricular electrical activity is monitored in two ventricular locations during ventricular fibrillation to detect coarse ventricular fibrillation complexes and contractions of the ventricular cardiac tissue. If the source voltage to the control circuit decreases to a turn-off voltage after the apparatus has started, the start circuit supplies a second starting current that is smaller than the first starting current. The battery pack has a U-shaped recess in a center. The implant is performed from the opposite sides of the wafer, and thus from the opposite sides of each active area.