Patent ID: 8073532

Claim:
An implantable defibrillator comprising: a lead electrode assembly including a number of electrodes; and a canister housing operational circuitry; wherein: the lead electrode assembly is coupled to the canister; the operational circuitry is configured to analyze cardiac events using a template having a template data set and template parameters, the template parameters including definition of an amplitude peak of the template data set as a fiducial point and start and end points surrounding the fiducial point; and the operational circuitry is configured to perform the steps of: capturing a signal using electrodes implanted in a patient's torso; configuring the captured signal in accordance with the template parameters, including defining a signal fiducial point in the captured signal, wherein the captured signal includes a plurality of signal samples and the signal fiducial point is set as a peak signal sample; aligning the template data set with the configured captured signal using the template and signal fiducial points; and comparing the aligned template data set to the signal samples in the configured captured signal, including comparing the template fiducial point to the sample fiducial point.