Method and apparatus for beat acquisition during template generation in a medical device having dual sensing vectors
First Claim
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1. A method of acquiring qualified beats for template generation in a cardiac medical device comprising:
- obtaining a first cardiac signal on a first sensing vector formed via a first subset of a plurality of extravascular electrodes;
obtaining a second cardiac signal on a second sensing vector formed via a second subset of the plurality of extravascular electrodes having at least one electrode different than the first subset, wherein the second cardiac signal is obtained concurrently with the first cardiac signal;
identifying beats within the first cardiac signal and the second cardiac signal;
applying beat qualification criteria to the beats within the first cardiac signal and the second cardiac signal to determine whether each of the beats is a qualified beat; and
generating a beat template based on at least a portion of the beats determined to be qualified beats.
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Abstract
Techniques are described for generating beat templates and utilizing those beat templates to detect a cardiac event, e.g., a tachyarrhythmia. In particular, example methods and devices for acquiring qualified beats for template generation are described. Additionally, techniques are described for selecting subsets of the qualified beats to actually use in generating a beat template.
113 Citations
27 Claims
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1. A method of acquiring qualified beats for template generation in a cardiac medical device comprising:
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obtaining a first cardiac signal on a first sensing vector formed via a first subset of a plurality of extravascular electrodes; obtaining a second cardiac signal on a second sensing vector formed via a second subset of the plurality of extravascular electrodes having at least one electrode different than the first subset, wherein the second cardiac signal is obtained concurrently with the first cardiac signal; identifying beats within the first cardiac signal and the second cardiac signal; applying beat qualification criteria to the beats within the first cardiac signal and the second cardiac signal to determine whether each of the beats is a qualified beat; and generating a beat template based on at least a portion of the beats determined to be qualified beats. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An extravascular implantable cardioverter-defibrillator (ICD) system comprising:
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an implantable electrical stimulation lead including a plurality of electrodes configured to sense cardiac electrical signals from an extravascular location within a patient; an ICD coupled to the implantable electrical stimulation lead, the ICD comprising; a housing that is formed at least partially of a conductive material to serve as a housing electrode; sensing circuitry located within the housing and configured to obtain a first cardiac signal from a first electrode vector formed via any combination of the plurality of electrodes of the electrical stimulation lead and the housing electrode and obtain a second cardiac signal on a second electrode vector formed via any combination of the plurality of electrodes of the electrical stimulation lead and the housing electrode, the second electrode vector having at least one electrode different than the first electrode vector, wherein the second cardiac signal is obtained concurrently with the first cardiac signal; a processor configured to identify beats within the first cardiac signal and the second cardiac signal, apply beat qualification criteria to the beats within the first cardiac signal and the second cardiac signal to determine whether each of the beats is a qualified beat, and generate a beat template based on at least a portion of the beats determined to be qualified beats. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An implantable cardiac device comprising:
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sensing circuitry located within the housing and configured to obtain a first cardiac signal on a first electrode vector formed via a first subset of a plurality of extravascular electrodes and obtain a second cardiac signal on a second electrode vector formed via a second subset of the plurality of extravascular electrodes having at least one electrode different than the first electrode vector, wherein the second cardiac signal is sensed concurrently with the first cardiac signal; a processor configured to; identify beats within the first cardiac signal and the second cardiac signal, apply beat qualification criteria to the beats within the first cardiac signal and the second cardiac signal to determine whether each of the beats is a qualified beat, wherein the beat criteria includes at least a heart rate criteria, a beat timing criteria between the beats in the first cardiac signal and corresponding beats in the second cardiac signal, and a beat interval criteria between successive beats in the first cardiac signal and successive beats in the second cardiac signal, generate a beat template based on at least a portion of the beats determined to be qualified beats, and detect a tachycardia based at least on a comparison of beats to the generated beat template; and therapy circuitry configured to provide an anti-tachycardia therapy from the extravascular location via at least a portion of the plurality of extravascular electrodes of the electrical stimulation lead in response to the processor detecting the tachycardia.
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Specification