A method and system provides for generating a snapshot representative of
one beat of a patient's normal cardiac rhythm. Cardiac rate channel
signals and shock channel signals are sensed. A fiducial point is
determined for a predefined number of the cardiac rate channel signals. A
predefined number of the shock channel signals are aligned using the
fiducial point. A template is generated using the aligned shock channel
signals, whereby the template is representative of one of the patient's
normal supra-ventricular conducted cardiac beats. The template is updated
on a periodic basis.
