A fluoroscopic image of an instrumented animal. A pigtail catheter positioned in the apex of LV for measuring LV pressure; B pigtail catheter for measuring aortic pressure positioned in the ascending aorta; C two 16-Fr introducers; D screwing intra-cardiac lead positioned in RV apex; E standard intra-cardiac lead positioned in CS; motion sensors are assembled on tips of both intra-cardiac leads (not visible); F standard pacing lead positioned in RA. This lead was inserted from a femoral vein