Patent ID: 7031764
Filing Date: 2006-04-18
Classification: A61B,A61N

Abstract:
1. A system comprising: an electrogram sensing circuit, configured to be coupled to at least one electrode for receiving an intrinsic cardiac signal, the electrogram sensing circuit configured to provide cardiac complexes and an indication of heart rate obtained from a subject's heart; a stored first morphological template, coupled to the electrogram sensing circuit, the stored first morphological template obtained from the heart, in the absence of an arrhythmia, while the subject is resting or inactive; a stored second morphological template, coupled to the electrogram sensing circuit, the stored second morphological template obtained from the heart under a condition different from that of the first morphological template; a correlation module, coupled to the first and second morphological templates and the electrogram sensing circuit, the correlation module configured to declare an indication of a first rhythm state if the indication of heart rate exceeds a first predetermined threshold value and a morphology of at least one cardiac complex of the intrinsic cardiac signal correlates to either of the first and second morphological templates, and configured to declare an indication of a second rhythm state if the indication of heart rate exceeds the first predetermined threshold value and a morphology of the at least one cardiac complex of the intrinsic cardiac signal is uncorrelated to both the first and second morphological templates.