Method and apparatus for verifying discriminating of tachycardia events in a medical device having dual sensing vectors
First Claim
1. A method of detecting a cardiac event in a medical device, comprising:
- sensing cardiac signals from a plurality of electrodes;
sensing a plurality of beats in response to the sensed cardiac signals;
identifying each beat of the plurality of beats as one of a normal beat and a not normal beat;
determining whether a number of beats identified as a normal beat is greater than a normal beat threshold;
determining, in response to the number of beats identified as a normal beat being greater than the normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval;
determining whether RR intervals associated with the beats identified as being normal beats are within an RR interval range; and
identifying the cardiac event as being one of shockable and not shockable in response to the determining.
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Accused Products
Abstract
A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, sensing a plurality of beats in response to the sensed cardiac signals, identifying each beat of the plurality of beats as one of a normal beat and a not normal beat, determining at least one of whether a number of beats identified as a normal beat is greater than a normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, and whether RR intervals associated with the beats identified as being normal beats are within an RR interval range, and identifying the cardiac event as being one of shockable and not shockable in response to the determining.
223 Citations
21 Claims
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1. A method of detecting a cardiac event in a medical device, comprising:
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sensing cardiac signals from a plurality of electrodes; sensing a plurality of beats in response to the sensed cardiac signals; identifying each beat of the plurality of beats as one of a normal beat and a not normal beat; determining whether a number of beats identified as a normal beat is greater than a normal beat threshold; determining, in response to the number of beats identified as a normal beat being greater than the normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval; determining whether RR intervals associated with the beats identified as being normal beats are within an RR interval range; and identifying the cardiac event as being one of shockable and not shockable in response to the determining. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medical device for detecting a cardiac event, comprising:
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a plurality of electrodes sensing cardiac signals having a plurality of beats; and a processor configured to identify each beat of the plurality of beats as one of a normal beat and a not normal beat, determine whether a number of beats identified as a normal beat is greater than a normal beat threshold, determine, in response to the number of beats identified as a normal beat being greater than the normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, determine whether RR intervals associated with the beats identified as being normal beats are within an RR interval range, and identify the cardiac event as being one of shockable and not shockable in response to the determining. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of detecting a cardiac event in a medical device, comprising:
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sensing cardiac signals from a plurality of electrodes; sensing a plurality of beats in response to the sensed cardiac signals; identifying each beat of the plurality of beats as one of a normal beat and a not normal beat; determining at least one of whether a number of beats identified as a normal beat is greater than a normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, and whether RR intervals associated with the beats identified as being normal beats are within an RR interval range; and identifying the cardiac event as being one of shockable and not shockable in response to the determining, wherein determining whether RR intervals associated with the beats identified as being normal beats are within an RR interval range comprises; comparing a duration of a first RR interval of the RR intervals associated with the beats identified as being normal beats to durations of RR intervals of the RR intervals associated with the beats identified as being normal beats other than the first RR interval to generate interval differences; determining whether the interval differences are less than a relative interval difference threshold; and determining the RR intervals associated with the beats identified as being normal beats are within the RR interval range in response to all of the interval differences being less than the relative interval difference threshold, and wherein determining whether the interval differences are less than a relative interval difference threshold comprises determining whether the durations of RR intervals of the RR intervals associated with the beats identified as being normal beats other than the first RR interval are within one sixteenth of the duration of the first RR interval.
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20. A medical device for detecting a cardiac event, comprising:
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a plurality of electrodes sensing cardiac signals having a plurality of beats; and a processor configured to identify each beat of the plurality of beats as one of a normal beat and a not normal beat, determine at least one of whether a number of beats identified as a normal beat is greater than a normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, and whether RR intervals associated with the beats identified as being normal beats are within an RR interval range, and identify the cardiac event as being one of shockable and not shockable in response to the determining, wherein determining whether RR intervals associated with the beats identified as being normal beats are within an RR interval range comprises; comparing a duration of a first RR interval of the RR intervals associated with the beats identified as being normal beats to durations of RR intervals of the RR intervals associated with the beats identified as being normal beats other than the first RR interval to generate interval differences; determining whether the interval differences are less than a relative interval difference threshold; and determining the RR intervals associated with the beats identified as being normal beats are within the RR interval range in response to all of the interval differences being less than the relative interval difference threshold, and wherein determining whether the interval differences are less than a relative interval difference threshold comprises determining whether the durations of RR intervals of the RR intervals associated with the beats identified as being normal beats other than the first RR interval are within one sixteenth of the duration of the first RR interval.
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21. A non-transitory, computer-readable storage medium storing instructions for causing a processor included in a medical device to perform a method for determining a cardiac event, the method comprising:
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sensing cardiac signals from a plurality of electrodes; sensing a plurality of beats in response to the sensed cardiac signals; identifying each beat of the plurality of beats as one of a normal beat and a not normal beat; determining whether a number of beats identified as a normal beat is greater than a normal beat threshold; determine, in response to the number of beats identified as a normal beat being greater than the normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval; determine whether RR intervals associated with the beats identified as being normal beats are within an RR interval range; and identify the cardiac event as being one of shockable and not shockable in response to the determining.
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Specification