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SYSTEMS AND METHODS FOR EMPLOYING MULTIPLE FILTERS TO DETECT T-WAVE OVERSENSING AND TO IMPROVE TACHYARRHYTHMIA DETECTION WITHIN AN IMPLANTABLE MEDICAL DEVICE

  • US 20090018595A1
  • Filed: 07/11/2007
  • Published: 01/15/2009
  • Est. Priority Date: 07/11/2007
  • Status: Active Grant
First Claim
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1. In an implantable medical device for processing electrical cardiac signals sensed via leads implanted within the heart of a patient, wherein the device has a first filter operative to substantially eliminate signals having frequencies associated with ventricular repolarization events while retaining signals having frequencies associated with at least some ventricular depolarization events and a second filter operative to pass signals having frequencies associated with ventricular depolarization events and ventricular repolarization events, a method comprising:

  • sensing electrical cardiac signals within the patient;

    selectively filtering the signals using the first filter;

    selectively filtering the signals using the second filter; and

    detecting tachyarrhythmia within the patient using signals filtered by the first filter in combination with signals filtered by the second filter.

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