Zoneless tachyarrhythmia detection with real-time rhythm monitoring
First Claim
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; and
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 declare 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.
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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.
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Citations
43 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; and
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 declare 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. - 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;
declare tachyarrhythmia 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; and
to deem an episode of tachyarrhythmia as an episode of slow tachyarrhythmia when the ventricular rate is less than a 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;
detecting a sudden rate increase in the V-V intervals, the sudden rate increase including a specified number of consecutive accelerated beats, wherein an accelerated beat is a V-V interval having a shorter duration than one or more previous V-V intervals;
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, 34)
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35. A method of using an implantable medical device (IMD) comprising:
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monitoring a ventricular contraction rate of a subject;
monitoring an atrial contraction rate of the subject; and
if the ventricular contraction rate exceeds the atrial contraction rate, declaring tachyarrhythmia. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification