Zoneless tachyarrhythmia detection with real-time rhythm monitoring
First Claim
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1. A system comprising:
- an implantable medical device (IMD) comprising;
a ventricular contraction sensing circuit operable to provide a sensed ventricular contraction signal;
a timer circuit operable to provide a ventricular time interval between ventricular contractions;
a controller circuit coupled to the timer circuit, the controller circuit operable to determine the ventricular contraction rate using the ventricular time interval, and wherein the controller circuit further includes a tachyarrhythmia detection module operable to;
determine an average ventricular contraction interval;
deem a current heartbeat as an accelerated beat if a difference between a last average ventricular contraction interval (V-V interval) and the current V-V interval is greater than a specified portion of the last average V-V interval;
declare tachyarrhythmia, in response to detecting a sudden rate increase, without requiring comparing a ventricular rate or time interval to a respective tachyarrhythmia detection rate or time interval threshold, wherein a sudden rate increase is defined as a specified number of accelerated beats; and
exclude an accelerated beat from a determination of the average V-V interval after the specified number of accelerated beats occurs.
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Abstract
A system including an implantable medical device (IMD). The IMD includes a ventricular contraction sensing circuit that provides a sensed ventricular contraction signal, a timer circuit that provides a ventricular time interval between ventricular contractions, and a controller circuit coupled to the timer circuit, the controller circuit determines the ventricular contraction rate using the ventricular time interval. The controller circuit further includes a tachyarrhythmia detection module that declares tachyarrhythmia, in response to detecting a sudden rate increase, without comparing a ventricular rate or time interval to a respective tachyarrhythmia detection rate or time interval threshold.
23 Citations
33 Claims
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1. A system comprising:
an implantable medical device (IMD) comprising; a ventricular contraction sensing circuit operable to provide a sensed ventricular contraction signal; a timer circuit operable to provide a ventricular time interval between ventricular contractions; a controller circuit coupled to the timer circuit, the controller circuit operable to determine the ventricular contraction rate using the ventricular time interval, and wherein the controller circuit further includes a tachyarrhythmia detection module operable to; determine an average ventricular contraction interval; deem a current heartbeat as an accelerated beat if a difference between a last average ventricular contraction interval (V-V interval) and the current V-V interval is greater than a specified portion of the last average V-V interval; declare tachyarrhythmia, in response to detecting a sudden rate increase, without requiring comparing a ventricular rate or time interval to a respective tachyarrhythmia detection rate or time interval threshold, wherein a sudden rate increase is defined as a specified number of accelerated beats; and exclude an accelerated beat from a determination of the average V-V interval after the specified number of accelerated beats occurs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system comprising:
an implantable medical device (IMD) comprising; a ventricular contraction sensing circuit operable to provide a sensed ventricular contraction signal; an atrial contraction sensing circuit operable to provide a sensed atrial contraction signal; a timer circuit operable to provide a time interval between heart contractions; and a controller circuit coupled to the timer circuit, the controller circuit operable to monitor a ventricular and an atrial contraction rate, and wherein the controller circuit further includes a tachyarrhythmia detection module operable to; determine an average ventricular contraction interval; deem a current heartbeat as an accelerated beat if a difference between a last average ventricular contraction interval (V-V interval) and the current V-V interval is greater than a specified portion of the last average V-V interval; declare tachyarrhythmia, without requiring a comparison to a tachyarrhythmia detection rate threshold or time interval threshold, in response to at least one of the ventricular contraction rate exceeding the atrial contraction rate by a specified rate difference, or detecting a sudden ventricular rate change, wherein a sudden ventricular rate increase is defined as a specified number of accelerated beats; exclude an accelerated beat from a determination of the average V-V interval after the specified number of accelerated beats occurs; and to deem an episode of tachyarrhythmia as an episode of slow tachyarrhythmia when the ventricular rate is less than a lowest specified tachyarrhythmia detection rate. - View Dependent Claims (19, 20, 21)
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22. A method of using an implantable medical device (IMD) comprising:
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monitoring ventricular contraction intervals (V-V intervals) of a subject; determining an average ventricular contraction interval; deeming a current heartbeat as an accelerated beat if a difference between a last average ventricular contraction interval (V-V interval) and the current V-V interval is greater than a specified portion of the last average V-V interval; detecting a sudden rate increase in the V-V intervals without requiring comparing a ventricular rate or time interval to a respective tachyarrhythmia detection rate or time interval threshold, the sudden rate increase including a specified number of consecutive accelerated beats; excluding an accelerated beat from a determination of the average V-V interval after the specified number of consecutive accelerated beats occurs; determining that the sudden rate increase is sustained for a specified period of time; and deeming the sudden rate increase indicative of tachyarrhythmia. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification