Patent ID: 8050754

Claim:
A method of cardiac signal analysis in an implantable medical device having at least a housing containing operational circuitry and a plurality of electrodes coupled to the operational circuitry for capturing cardiac signals comprising: capturing a cardiac event using at least first and second vector views from the electrodes; analyzing the captured cardiac event using a first method of analysis by comparing the captured cardiac event as seen from the first vector view to a stored sinus template of the first vector view; analyzing the captured cardiac event using a second method of analysis including comparing the captured cardiac event as seen from the second vector view to a cardiac event just previous to the captured cardiac event, as seen from the second vector view; identifying whether an arrhythmia is likely occurring and, if so, distinguishing a supraventricular arrhythmia from a ventricular originating arrhythmia using results from the first and second methods to determine whether a ventricular originating arrhythmia is occurring; and if a ventricular originating arrhythmia is occurring, directing cardiac defibrillation therapy to the patient.