An immersive tool that allows cardiologists to have a synergistic view of the patient's anatomy with the ability to overlay the two 3D representations of the coronary sinus and ventricles. The interactive interface allows zooming, panning, and selecting a projection plan. You can choose from multiple layers of information such as vein diameters, ventricular activation maps, distance calculations, and vein section displays. Additionally, the accurate simulation tool replicates catheter access to the coronary sinus, providing a forecast of the complexity and feasibility of implanting the left ventricular electrocatheter for the specific patient.