Surgery – Diagnostic testing – Cardiovascular
Reexamination Certificate
2007-08-20
2010-10-12
Layno, Carl H (Department: 3766)
Surgery
Diagnostic testing
Cardiovascular
C607S001000, C607S002000, C600S508000, C600S509000, C600S515000
Reexamination Certificate
active
07813791
ABSTRACT:
A Fast Fourier Transform (FFT) converts time-varying event waveforms into the frequency domain waveforms to thereby decompose the events into their spectral components, which are analyzed to distinguish R-waves from T-waves. In some embodiments, the FFT is only activated if a ventricular tachyarrhythmia is already indicated. For example, an initial ventricular rate may be derived from a ventricular IEGM based on all events detected therein. The initial ventricular rate is compared against one or more thresholds representative of ventricular tachycardia (VT) and/or ventricular fibrillation (VF) to determine if VT/VF is indicated. If so, the FFT is activated to distinguish R-waves from T-waves and, in particular, to detect and eliminate T-wave oversensing. Then, the ventricular rate is re-determined based only on the rate of true R-waves. Therapy is delivered if VT/VF is still detected.
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Boileau Peter
Bornzin Gene A.
Gill Jong
Layno Carl H
Malamud Deborah
Pacesetter Inc.
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