Method and apparatus for detecting arrhythmias in a subcutaneous medical device
First Claim
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1. A subcutaneously implantable cardiac medical device, comprising:
- a plurality of electrodes to sense a cardiac signal along at least one sensing vector to detect a first interval and a second interval associated with a first detected event; and
a processor configured to;
determine that the first interval and the second interval are shorter than a predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise,in response to determining that the first interval and the second interval are shorter than the predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise, determine whether a comparison of the first interval to the second interval satisfies a predetermined stability threshold, the stability threshold comprising an indication of a threshold level of similarity between the first interval and the second interval,based on the determination of whether the comparison satisfies the predetermined stability threshold, select a criterion to apply to the cardiac signal to determine whether the detected event is shockable, andcontrol delivery of an anti-tachyarrhythmia shock based on the application of the selected criterion to the cardiac signal indicating that the detected event is shockable.
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Abstract
A subcutaneously implantable cardiac medical device and a method of sensing a cardiac signal therein that includes a plurality of electrodes to sense a cardiac signal along a plurality of sensing vectors to detect a first interval and a second interval associated with a first detected event, and a processor configured to determine whether the first interval and the second interval are shorter than a predetermined threshold, determine whether the first interval and the second interval are similar, and determine, in response to the first interval and the second interval being similar, whether the sensed cardiac signal is either a noisy signal or a QRS signal.
141 Citations
21 Claims
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1. A subcutaneously implantable cardiac medical device, comprising:
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a plurality of electrodes to sense a cardiac signal along at least one sensing vector to detect a first interval and a second interval associated with a first detected event; and a processor configured to; determine that the first interval and the second interval are shorter than a predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise, in response to determining that the first interval and the second interval are shorter than the predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise, determine whether a comparison of the first interval to the second interval satisfies a predetermined stability threshold, the stability threshold comprising an indication of a threshold level of similarity between the first interval and the second interval, based on the determination of whether the comparison satisfies the predetermined stability threshold, select a criterion to apply to the cardiac signal to determine whether the detected event is shockable, and control delivery of an anti-tachyarrhythmia shock based on the application of the selected criterion to the cardiac signal indicating that the detected event is shockable. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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sensing the cardiac signal along at least one sensing vector to detect a first interval and a second interval associated with a first detected event; determining that the first interval and the second interval are shorter than a predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise; in response to determining that the first interval and the second interval are shorter than a predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise, determining whether a comparison of the first interval to the second interval satisfies a predetermined stability threshold, the stability threshold comprising an indication of a threshold level of similarity between the first interval and the second interval; based on the determination of whether the comparison satisfies the predetermined stability threshold, selecting a criterion to apply to the cardiac signal to determine whether the detected event is shockable, and controlling delivery of an anti-tachyarrhythmia shock based on the application of the selected criterion to the cardiac signal indicating that the detected event is shockable. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer-readable medium storing a set of instructions which cause a processor of an implantable medical device to perform a method of sensing a cardiac signal in a subcutaneously implantable cardiac medical device, comprising:
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sensing the cardiac signal along at least one sensing vector to detect a first interval and a second interval associated with a first detected event; determining that the first interval and the second interval are shorter than a predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise; in response to determining that the first interval and the second interval are shorter than a predetermined threshold and that the cardiac signal sensed along the sensing vector is not corrupted by noise, determining whether a comparison of the first interval to the second interval satisfies a predetermined stability threshold, the stability threshold comprising an indication of a threshold level of similarity between the first interval and the second interval; based on the determination of whether the comparison satisfies the predetermined stability threshold, selecting a criterion to apply to the cardiac signal to determine whether the detected event is shockable, and controlling delivery of an anti-tachyarrhythmia shock based on the application of the selected criterion to the cardiac signal indicating that the detected event is shockable. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification