Patent ID: 8116871

Claim:
A method of classifying a cardiac response to a pacing pulse, comprising: delivering, from within a patient, a cardiac pacing pulse; sensing one or more composite cardiac signals following delivery of the cardiac pacing pulse using at least three spatially distributed implantable electrodes; performing source separation using the sensed one or more composite cardiac signals, the source separation algorithmically separating one or more components of the sensed composite cardiac signals according to correlation between components of cardiac origin; producing one or more cardiac signal vectors representative of all or a portion of one or more cardiac activation sequences based on the separated one or more components of the sensed composite cardiac signals; comparing an orientation of the one or more cardiac signal vectors with predetermined vector orientation criteria comprising at least a capture vector orientation criterion and a fusion vector orientation criterion; and classifying the cardiac response to the pacing pulse as one of capture and fusion based on the comparison.