Method and apparatus for detection of tachyarrhythmia using cycle lengths
First Claim
1. A method of identifying a cardiac event, comprising:
- detecting sensed events using a first detection format in a first state during detection of other than the cardiac event;
advancing from the first state to a second state corresponding to suspending the detecting using the first detection format and detecting sensed events using a second format different from the first detection format in response to the first detection format determining the sensed events correspond to the cardiac event while in the first state;
advancing from the second state to the first state in response to the second detection format determining the sensed events do not correspond to the cardiac event while in the second state;
advancing from the second state to a third state in response to the second detection format determining the sensed events correspond to the cardiac event while in the second state, the third state corresponding to detecting sensed events using the first detection format;
advancing from the third state to a fourth state in response to the sensed events being determined not to correspond to the cardiac event while in the third state, the fourth state corresponding to suspending the detection using the first format and detecting sensed events using the second detection format;
advancing from the fourth state to the third state in response to the sensed events being determined to correspond to the cardiac event while in the fourth state; and
advancing from the fourth state to the first state in response to the sensed events being determined not to correspond to the cardiac event while in the fourth state.
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Abstract
A multi-layer method for detecting atrial arrhythmias using ventricular cycle length information that includes performing a base layer algorithm for detecting the onset and offset of an atrial tachyarrhythmia. The multi-layer method further includes one or more higher layer algorithms executed in response to a base layer detection to confirm or reject the base layer detection. The base layer is designed to operate with high sensitivity to atrial fibrillation and/or organized atrial tachycardia and the higher layer is designed to operate with high sensitivity and high specificity to atrial fibrillation and/or organized atrial tachycardia.
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Citations
18 Claims
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1. A method of identifying a cardiac event, comprising:
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detecting sensed events using a first detection format in a first state during detection of other than the cardiac event;
advancing from the first state to a second state corresponding to suspending the detecting using the first detection format and detecting sensed events using a second format different from the first detection format in response to the first detection format determining the sensed events correspond to the cardiac event while in the first state;
advancing from the second state to the first state in response to the second detection format determining the sensed events do not correspond to the cardiac event while in the second state;
advancing from the second state to a third state in response to the second detection format determining the sensed events correspond to the cardiac event while in the second state, the third state corresponding to detecting sensed events using the first detection format;
advancing from the third state to a fourth state in response to the sensed events being determined not to correspond to the cardiac event while in the third state, the fourth state corresponding to suspending the detection using the first format and detecting sensed events using the second detection format;
advancing from the fourth state to the third state in response to the sensed events being determined to correspond to the cardiac event while in the fourth state; and
advancing from the fourth state to the first state in response to the sensed events being determined not to correspond to the cardiac event while in the fourth state. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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2. The method of claim 2, further comprising detecting sensed events using the first detection format and the second detection format while in the third state.
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4. The method of claim 3, further comprising alternating between detecting sensed events using the first detection format and detecting sensed events using the second detection format while in the third state.
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11. A method of identifying a cardiac event, comprising:
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detecting sensed events using a first detection format in a first state during detection of other than the cardiac event;
advancing from the first state to a second state corresponding to suspending the detecting using the first detection format and detecting sensed events using a second format different from the first detection format in response to the first detection format determining the sensed events correspond to the cardiac event while in the first state;
advancing from the second state to the first state in response to the second detection format determining the sensed events do not correspond to the cardiac event while in the second state;
advancing from the second state to a third state in response to the second detection format determining the sensed events correspond to the cardiac event while in the second state, the third state corresponding to detecting sensed events using the first detection format;
advancing from the third state to a fourth state in response to the sensed events being determined not to correspond to the cardiac event while in the third state, the fourth state corresponding to suspending the detection using the first format and detecting sensed events using the second detection format;
advancing from the fourth state to the third state in response to the sensed events being determined to correspond to the cardiac event while in the fourth state; and
advancing from the fourth state to the first state in response to the sensed events being determined not to correspond to the cardiac event while in the fourth state, wherein the second detection format comprises;
determining a plurality of cycle lengths associated with sensed cardiac signals;
determining differences between consecutive cycle lengths of the determined plurality of cycle lengths;
determining cluster signature metrics in response to the determined differences;
generating a plot corresponding to the determined differences; and
determining a number of the determined differences that are located within a plurality of segments of the plot defined by a range of magnitudes and phases relative to an origin of the plot and corresponding to patterns associated with the cardiac event, and wherein the first detection format includes a first metric corresponding to a first change in cycle lengths, a second metric corresponding to one of a decrease in ventricular rate and an increase in ventricular rate, and a third metric corresponding to a second change in cycle lengths. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for detecting atrial arrhythmias, comprising:
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executing a base layer algorithm for detecting an onset of an atrial tachyarrhythmia;
executing a higher layer algorithm in response to detecting the onset of the atrial tachyarrhythmia by the base layer algorithm for confirming or rejecting the atrial tachyarrhythmia onset detection by the base layer;
executing the base layer algorithm in response to confirmation of the atrial tachyarrhythmia detection by the higher layer algorithm for detecting an offset of the atrial tachyarrhythmia and otherwise executing the base layer algorithm in response to rejection of the atrial tachyarrhythmia by the higher layer algorithm for detecting an onset of an atrial tachyarrhythmia;
executing the higher layer algorithm in response to detecting the offset of the atrial tachyarrhythmia by the base layer algorithm for confirming the termination of the atrial tachyarrhythmia.
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Specification