Patent ID: 7890159

Claim:
A cardiac method, comprising: sensing a plurality of composite cardiac signals over time at a plurality of patient-internal locations; performing one or more source separations using one or more of the sensed plurality of composite signals; producing one or more cardiac signal vectors indicative of a cardiac depolarization sequence of an area of the heart based on the one or more source separations; establishing a baseline of a characteristic of the one or more cardiac signal vectors; performing at least one subsequent source separation using at least one of the sensed plurality of composite signals; monitoring the characteristic of the one or more cardiac signal vectors based on the at least one subsequent source separation; detecting a change in the characteristic of the one or more cardiac signal vectors relative to the baseline of the characteristic of the one or more cardiac signal vectors; and identifying a cardiac condition based on the detected change, wherein performing the one or more source separations, producing the one or more cardiac signal vectors, establishing the baseline, performing the at least one subsequent source separation, monitoring, detecting, and identifying are performed at least in part by circuitry of a medical system.