Systems and methods for employing multiple filters to detect T-wave oversensing and to improve tachyarrhythmia detection within an implantable medical device
First Claim
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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 oversensing of ventricular repolarization events using a processor configured to detect oversensing of ventricular events within signals filtered by the second filter by comparing the signals filtered by the second filter with the signals filtered by the first filter.
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Abstract
Techniques for detecting tachyarrhythmia and also for preventing T-wave oversensing use signals filtered by a narrowband bradycardia filter in combination with signals filtered by a narrowband tachycardia filter. A separate wideband filter may also be used.
25 Citations
17 Claims
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1. A method comprising:
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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 oversensing of ventricular repolarization events using a processor configured to detect oversensing of ventricular events within signals filtered by the second filter by comparing the signals filtered by the second filter with the signals filtered by the first filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A ventricular repolarization oversensing detection system for use in an implantable medical device having filters for filtering electrical cardiac signals sensed via leads implanted within a heart of a patient, the system comprising:
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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; a second filter operative to pass signals having frequencies associated with ventricular depolarization events and ventricular repolarization events; and a combined first filter/second filter-based oversensing detection system operative to detect oversensing of ventricular repolarization events within signals filtered by the second filter by comparing the signals filtered by the second filter with the signals filtered by the first filter. - View Dependent Claims (14, 15, 16)
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17. An implantable medical device comprising:
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means for sensing electrical cardiac signals within a patient; first means for filtering the signals to substantially eliminate signals having frequencies associated with ventricular repolarization events; second means for filtering the signals to pass signals having frequencies associated with ventricular depolarization events and ventricular repolarization events; and means for detecting oversensing of ventricular repolarization events based on a comparison of the signals filtered by the second means for filtering and the signals filtered by the first means for filtering.
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Specification