Patent ID: 7369890

Claim:
A system adapted to be coupled to a heart having a first location and a second location, comprising: at least two electrodes to sense a first cardiac signal from the first location and a second cardiac signal from the second location, the first and second signals associated with cardiac complexes; a signal sensing circuit, coupled to the at least two electrodes to receive and amplify the cardiac complexes; a controller, coupled to the signal sensing circuit, wherein the controller receives the amplified cardiac complexes, and wherein the controller comprises: an analyzer to compute a set of interelectrode detection time differences each between one of the cardiac complexes associated with the first location and the one of the cardiac complexes associated with the second location for a predetermined time interval, wherein the interelectrode detection time differences are each a propagation time of one of the cardiac complexes from the first location to the second location; wherein the analyzer further computes a detection time difference variability using the computed set of interelectrode detection time differences, wherein the detection time difference variability includes a measure of an average absolute value of the interelectrode detection time differences; and a comparator, coupled to the analyzer, to compare the computed detection time difference variability with a predetermined detection time difference variability threshold value, classify the first and second signals based on the outcome of the comparison and issue a command signal based on the classification.