Patent ID: 8868184

Claim:
A method for use with an implantable medical device for implant within a patient, the method comprising: concurrently detecting a plurality of cardiogenic impedance signals along different sensing vectors, each vector terminating within a same chamber of the patient's heart; detecting a measure of mechanical dyssynchrony in the same chamber by detecting differences among the cardiogenic impedance signals with respect to a morphological parameter of the cardiogenic impedance signals; and controlling at least one device function based on the measure of mechanical dyssynchrony wherein detecting a measure of mechanical dyssynchrony includes: delivering a pacing pulse to the heart of the patient; for each of the cardiogenic impedance signals, examining the signal to detect a maximum in a first time derivative of the signal after pulse delivery and then measuring the time delay from the pulse to the maximum in the first time derivative and determining peak velocity delay times for each of the cardiogenic impedance signals; and comparing the peak velocity delay times derived from the cardiogenic impedance signals to generate the measure of mechanical dyssynchrony.