CARDIAC RHYTHM MANAGEMENT SYSTEMS AND METHODS USING MULTIPLE MORPHOLOGY TEMPLATES FOR DISCRIMINATING BETWEEN RHYTHMS
First Claim
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1. A system comprising:
- a memory configured to store a first morphological template and a second morphological template, the first morphological template representing a subject'"'"'s heart rhythm in the absence of an arrhythmia and the second morphological template representing the subject'"'"'s heart rhythm under a condition different from that of the first morphological template;
an electrogram sensing circuit configured to sense a heart rate and a cardiac complex, the cardiac complex having a morphology; and
a processor, coupled to the electrogram sensing circuit, configured to access the first and second morphological templates from the memory and to declare an indication of one of a first and a second rhythm state by determining a degree of correlation between the cardiac complex and at least one of the first and second morphological templates.
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Abstract
This document describes systems, devices, and methods that use multiple morphology templates for discriminating between rhythms, such as supraventricular tachyarrhythmias (SVTs) and ventricular tachyarrhythmias (VTs), for delivering a countershock in response to a VT episode, but withholding delivery of such a countershock in response to an SVT episode. In certain examples, the particular morphology used for storing morphological features is selected at least in part using a sensor-indicated activity level of a subject, or a metabolic need of the subject.
108 Citations
20 Claims
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1. A system comprising:
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a memory configured to store a first morphological template and a second morphological template, the first morphological template representing a subject'"'"'s heart rhythm in the absence of an arrhythmia and the second morphological template representing the subject'"'"'s heart rhythm under a condition different from that of the first morphological template; an electrogram sensing circuit configured to sense a heart rate and a cardiac complex, the cardiac complex having a morphology; and a processor, coupled to the electrogram sensing circuit, configured to access the first and second morphological templates from the memory and to declare an indication of one of a first and a second rhythm state by determining a degree of correlation between the cardiac complex and at least one of the first and second morphological templates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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accessing a first morphological template, the first morphological template representing a subject'"'"'s heart rhythm in the absence of an arrhythmia; accessing a second morphological template, the second morphological template representing the subject'"'"'s heart rhythm under a condition different from that of the first morphological template; accessing at least one cardiac complex; determining a degree of correlation between the at least one cardiac complex and at least one of the first and second morphological templates; and declaring one of first and second rhythm states at least in part using the determined degree of correlation. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A machine-readable medium including instructions that, when performed by a machine, cause the machine to:
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access a first morphological template, the first morphological template representing a subject'"'"'s heart rhythm in the absence of an arrhythmia; access a second morphological template, the second morphological template representing the subject'"'"'s heart rhythm under a condition different from that of the first morphological template; access at least one cardiac complex; determine a degree of correlation between the at least one cardiac complex and at least one of the first and second morphological templates; and declare one of first and second rhythm states at least in part using the determined degree of correlation.
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20. A system comprising:
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means for accessing a first morphological template, the first morphological template representing a subject'"'"'s heart rhythm in the absence of an arrhythmia; means for accessing a second morphological template, the second morphological template representing the subject'"'"'s heart rhythm under a condition different from that of the first morphological template; means for accessing at least one cardiac complex; means for determining a degree of correlation between the at least one cardiac complex and at least one of the first and second morphological templates; and means for declaring one of first and second rhythm states at least in part using the determined degree of correlation.
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Specification