Patent ID: 8504144
Filing Date: 2013-08-06
Classification: A61B,A61N

Abstract:
1. A method comprising: sensing electrical cardiac signals via leads implanted within a heart of a patient; filtering the signals using a first filter configured to substantially eliminate signals having frequencies associated with ventricular repolarization events while retaining signals having frequencies associated with at least some ventricular depolarization events; filtering the signals using a second filter configured to pass signals having frequencies associated with ventricular depolarization events and ventricular repolarization events; and detecting tachyarrhythmia using a processor configured to detect tachyarrhythmia using ventricular depolarization events from signals filtered by the first filter in combination with ventricular rates determined from signals filtered by the second filter: wherein detecting tachyarrhythmia further comprises: detecting a preliminary indication of tachyarrhythmia using ventricular depolarization events from signals filtered by the first filter; and in response, confirming detection of tachyarrhythmia using the ventricular rates determined from signals filtered by the second filter.