Electric Tomography — A Real-Time Technique for Measuring Cardiac Performance

Introduction: Electric Tomography (ET) shows great promise as a tool for reproducibly measuring cardiac performance in an operator-independent manner. ET tracks the motion of electrodes on cardiac leads by detecting changes in voltage as they move through 3D electric fields. Since the electrodes maintain a consistent spatial relationship with underlying myocardium, cardiac displacement, velocity, and acceleration can be determined. A prior clinical study (n=35) demonstrated that ET tracks cardiac motion in a physiologically meaningful manner.