Patent ID: 7797036
Filing Date: 2010-09-14
Classification: A61B,A61N

Abstract:
1. A method, comprising: sensing a plurality of composite signals using a plurality of implantable electrodes over a plurality of cardiac cycles, each of the composite signals sensed within a window associated with a cardiac sequence feature that is opened for each cycle of the plurality of cardiac cycles, wherein the electrodes are distributed between a can and at least one lead, and the can and the lead are configured for implantation; performing a source separation using the sensed plurality of composite signals, by which the sensed plurality of composite signals are separated according to their respective sources and one or more cardiac signal vectors are produced, each of the cardiac signal vectors representing angular orientation of a wavefront of the cardiac sequence feature of a respective cardiac cycle of the plurality of cardiac cycles; determining a baseline angular orientation of the cardiac signal vectors for the plurality of cardiac cycles; monitoring angular orientation of one or more additional cardiac signal vectors produced by source separation of subsequent composite signals sensed within one or more detection windows associated with the cardiac sequence feature, the subsequent composite signals sensed subsequent to the sensing of the plurality of composite signals; and detecting a deviation in angular orientation of the one or more additional cardiac signal vectors from the baseline, wherein at least one of the steps of performing, determining, monitoring, and detecting is implemented at least in part by a circuit.