Patent ID: 7840267

Claim:
An apparatus comprising: a first impedance sensing circuit to sense a first intracardiac local impedance signal from an implantable first bipolar pair of impedance sensing electrodes, wherein the first intracardiac local impedance signal is indicative of a cardiac local wall motion of a first cardiac region; a second sensing circuit configured to produce a second sensor signal indicative of cardiovascular activity, wherein the second sensor signal includes a second intracardiac local impedance signal and is indicative of a cardiac local wall motion of a second cardiac region; and an impedance-based cardiac dyssynchrony detector configured for detecting cardiac dyssynchrony using a relationship between the first intracardiac local impedance signal and the second sensor signal, wherein the cardiac dyssynchrony detector is configured for detecting cardiac dyssynchrony using a correlation between the first intracardiac local impedance signal and the second intracardiac local impedance signal.