Method and apparatus for detecting non-sustaining ventricular tachyarrhythmia
First Claim
1. An implantable medical device, comprising:
- a sensing circuit configured to sense a cardiac signal; and
a controller configured to control delivery of an anti-tachyarrhythmia therapy, the controller including;
a tachyarrhythmia detector coupled to the sensing circuit, the tachyarrhythmia detector configured to detect an initiation event indicative of a tachyarrhythmia episode from the cardiac signal, start a tachyarrhythmia detection and classification process in response to a detection of the initiation event, and to restart or extend the tachyarrhythmia detection and classification process in response to a detection of an inhibitory event indicative of a need to inhibit the delivery of the anti-tachyarrhythmia therapy, the tachyarrhythmia detection and classification process determining whether the tachyarrhythmia episode sustains and is to be treated by the anti-tachyarrhythmia therapy;
a beat detector coupled to the sensing circuit, the beat detector configured to detect heart beats from the cardiac signal;
a heart rate detector coupled to the beat detector, the heart rate detector configured to detect a heart rate associated with each of the detected heart beats;
a beat classifier coupled to the heart rate detector, the beat classifier configured to classify each beat of the detected heart beat as a fast beat in response to the each beat associated with a heart rate within a tachyarrhythmia detection zone and a slow beat in response to the each beat associated with a heart rate below the tachyarrhythmia detection zone or being a paced heart beat; and
an inhibitory event detector coupled to the tachyarrhythmia detector and the beat classifier, the inhibitory event detector including an arrhythmia pattern detector configured to detect a specified pattern including repetitive sequences of the fast and slow beats and indicate a detection of the inhibitory event in response to a detection of the specified pattern.
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Abstract
An implantable medical device controls an anti-tachyarrhythmia therapy by detecting a tachyarrhythmia episode from a cardiac signal and analyzing the detected tachyarrhythmia episode in a tachyarrhythmia detection and analysis process to determine whether the anti-tachyarrhythmia therapy needs to be delivered. The tachyarrhythmia detection and classification process includes detection of inhibitory events each indicating that the tachyarrhythmia episode is of a type not to be treated by the anti-tachyarrhythmia therapy or that the tachyarrhythmia episode is not sustaining. The detection of each of the inhibitory events causes the tachyarrhythmia detection and classification process to be restarted or extended, or the delivery of the anti-tachyarrhythmia therapy to be withheld.
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Citations
20 Claims
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1. An implantable medical device, comprising:
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a sensing circuit configured to sense a cardiac signal; and a controller configured to control delivery of an anti-tachyarrhythmia therapy, the controller including; a tachyarrhythmia detector coupled to the sensing circuit, the tachyarrhythmia detector configured to detect an initiation event indicative of a tachyarrhythmia episode from the cardiac signal, start a tachyarrhythmia detection and classification process in response to a detection of the initiation event, and to restart or extend the tachyarrhythmia detection and classification process in response to a detection of an inhibitory event indicative of a need to inhibit the delivery of the anti-tachyarrhythmia therapy, the tachyarrhythmia detection and classification process determining whether the tachyarrhythmia episode sustains and is to be treated by the anti-tachyarrhythmia therapy; a beat detector coupled to the sensing circuit, the beat detector configured to detect heart beats from the cardiac signal; a heart rate detector coupled to the beat detector, the heart rate detector configured to detect a heart rate associated with each of the detected heart beats; a beat classifier coupled to the heart rate detector, the beat classifier configured to classify each beat of the detected heart beat as a fast beat in response to the each beat associated with a heart rate within a tachyarrhythmia detection zone and a slow beat in response to the each beat associated with a heart rate below the tachyarrhythmia detection zone or being a paced heart beat; and an inhibitory event detector coupled to the tachyarrhythmia detector and the beat classifier, the inhibitory event detector including an arrhythmia pattern detector configured to detect a specified pattern including repetitive sequences of the fast and slow beats and indicate a detection of the inhibitory event in response to a detection of the specified pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating an implantable medical device, the method comprising:
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sensing a cardiac signal; detecting heart beats from the cardiac signal; detecting a heart rate associated with each of the detected heart beats; classifying each beat of the detected heart beats a fast beat in response to the each beat associated with a heart rate within a tachyarrhythmia detection zone and a slow beat in response to the each beat associated with a heart rate below the tachyarrhythmia detection zone or being a paced heart beat; detecting an initiation event indicative of a tachyarrhythmia episode from the cardiac signal; starting a tachyarrhythmia detection and classification process in response to a detection of the initiation event; detecting a specified pattern including repetitive sequences of the fast and slow beats; indicating a detection of an inhibitory event indicative of a need to inhibit a delivery of an anti-tachyarrhythmia therapy in response to a detection of the specified pattern; and restarting or extending the tachyarrhythmia detection and classification process in response to detection of the inhibitory event. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification