Cardiac rhythm management systems and methods using multiple morphology templates for discriminating between rhythms
Patent 7031764 Issued on April 18, 2006. Estimated Expiration Date: November 8, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
600/518, Tachycardia or fibrillation detected607/4, Combined cardioverting/defibrillating and pacing607/5, Cardioverting/defibrillating607/14, Treating or preventing abnormally high heart rate600/519, Detecting signal repetition rate600/509, Detecting heartbeat electric signal33/1C, Curve and chart analysis600/515, Detecting arrhythmia607/6, Sensing body condition or signal other than electrocardiographic signal607/9, Heart rate regulating (e.g., pacing)607/18, Plural sensed conditions607/30, Remotely changing, (e.g., programming, pacer) parameters or operation607/19, Physical activity607/28, Measuring pacing, threshold, capture margin, or contact impedance607/32, Communicating with pacer (e.g., telemetry)600/523, Signal display or recording607/27, Testing or monitoring pacer function600/516, Variation in duration of segment of PQRST signal waveform (e.g., QRS complex, etc.) detected600/517, Vertical variation of PQRST signal waveform (e.g., amplitude of QRS complex, etc.) detected600/508Heart
Multiple morphology templates for discliminating between rhythms have been used, such as supraventricular tachyarrhythmias (SVTs) and ventricular tachyarrhythmias (VTs), for delivering a countershock in response to a VT episode, but withholding delivery of such a countershock in response to an SVT episode. In certain examples, the particular morphology used for storing morphological features is selected at least in part using a sensor-indicated activity level of a subject, or a metabolic need of the subject.
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