Systems and methods for employing an FFT to distinguish R-waves from T-waves using an implantable medical device
US7813791B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2007 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Feb 20, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3621
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.