Patent ID: 7941208

Claim:
A method of operating a cardiac system that includes an implantable cardiac device that is implanted in a patient, the implantable cardiac device including implantable electrodes adapted to be positioned at respective specific sites within the patient, the method comprising: for a first period of time: sensing and storing electrogram signals of cardiac electrical activity from the patient in the implantable cardiac device, the sensing being carried out using the implantable electrodes; detecting first intrinsic tachyarrhythmia episodes using the electrogram signals; and identifying first tachyarrhythmia episode morphology types based on morphological characteristics of the electrogram signals for the detected first intrinsic tachyarrhythmia episodes; and after the first period of time, in preparation for performing ablation: inducing a tachyarrhythmia episode; sensing electrogram signals from the induced tachyarrhythmia episode using the implantable electrodes; using the sensed electrogram signals from the induced tachyarrhythmia episode to compare morphological characteristics of the induced tachyarrhythmia episode to the morphological characteristics of the detected first intrinsic tachyarrhythmia episodes; and indicating a similarity between the induced tachyarrhythmia episode and at least one of the first tachyarrhythmia episode morphology types identified from the stored electrogram signals to facilitate performing the ablation; wherein the method further comprises: for each identified first tachyarrhythmia episode morphology type, determining how many of the detected first intrinsic tachyarrhythmia episodes exhibited that identified episode morphology type; and for each identified first tachyarrhythmia episode morphology type, displaying a number of how many first intrinsic tachyarrhythmia episodes were detected for that identified episode morphology type.