Patent ID: 8155739

Claim:
A method of characterizing motion of a first electrode implanted along a lateral wall of the left ventricle and a second electrode implanted along a septal wall between the right ventricle and the left ventricle, said method comprising: for a time in a cardiac cycle, determining a three-dimensional position of the first implanted electrode and a three-dimensional position of the second implanted electrode; for another time in a cardiac cycle, determining a three-dimensional position of the first implanted electrode and a three-dimensional position of the second implanted electrode; determining a first vector differential based on a vector for the first implanted electrode for the time in the cardiac cycle and another vector for the first implanted electrode for the other time in the cardiac cycle; determining a second vector differential based on a vector for the second implanted electrode for the time in the cardiac cycle and another vector for the second implanted electrode for the other time in the cardiac cycle; calculating the dot product of the first vector differential and the second vector differential; and if the dot product is less than zero, determining that the first electrode and the second electrode either move toward each other or away from each other.