BEAT-MORPHOLOGY MATCHING SCHEME FOR CARDIAC SENSING AND EVENT DETECTION
First Claim
6-1. The method of claim 1, further comprising:
- after aligning the template alignment point and the unknown cardiac signal alignment point, shifting the template a plurality of times by shifting the template alignment point relative to the unknown signal alignment point by at least one sample point to obtain a plurality of alignments between the template and the unknown cardiac signal;
determining a morphology match score for each one of the plurality of alignments;
determining a greatest one of the first morphology match metric and the morphology match metrics for the plurality of alignments; and
classifying the unknown cardiac signal in response to the determined one of the first morphology match metric and the morphology match metrics for the plurality of alignments.
1 Assignment
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Accused Products
Abstract
A medical device and associated method for classifying an unknown cardiac signal operate to sense a cardiac signal over known cardiac cycles and generate a template of the known cardiac cycles. An unknown cardiac signal is sensed over an unknown cardiac cycle. A template alignment point and an unknown cardiac signal alignment point are identified by using a fourth order difference signal. The template and the unknown cardiac signal are aligned across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point. A morphology match metric measuring a similarity between the aligned template and the unknown cardiac signal is computed.
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Citations
20 Claims
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6-1. The method of claim 1, further comprising:
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after aligning the template alignment point and the unknown cardiac signal alignment point, shifting the template a plurality of times by shifting the template alignment point relative to the unknown signal alignment point by at least one sample point to obtain a plurality of alignments between the template and the unknown cardiac signal; determining a morphology match score for each one of the plurality of alignments; determining a greatest one of the first morphology match metric and the morphology match metrics for the plurality of alignments; and classifying the unknown cardiac signal in response to the determined one of the first morphology match metric and the morphology match metrics for the plurality of alignments.
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9. A medical device for classifying cardiac beats for use in detecting cardiac rhythms, comprising:
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a plurality of electrodes for sensing an electrocardiogram (ECG) signal; a sensing module coupled to the electrodes for sensing a cardiac signal over a plurality of cardiac cycles and an unknown cardiac signal over an unknown cardiac cycle; and a processor coupled to the sensing module and configured to; determine a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles; determine a template alignment point and an unknown cardiac signal alignment point, wherein determining the template alignment point and the unknown cardiac signal alignment point comprises determining a fourth order difference signal; align the template and the unknown cardiac signal across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point; and determine a first morphology match metric measuring a similarity between the aligned template and the unknown cardiac signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory, computer-readable medium storing a set of instructions, which when executed by a processor of a medical device causes the device to:
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sense a cardiac signal over a plurality of cardiac cycles using a plurality of electrodes coupled to a sensing module; generate a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles; sense an unknown cardiac signal over an unknown cardiac cycle; determine a template alignment point and an unknown cardiac signal alignment point, wherein determining the template alignment point and the unknown cardiac signal alignment point comprises determining a fourth order difference signal; align the template and the unknown cardiac signal across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point; and determine a morphology match metric measuring a similarity between the aligned template and the unknown cardiac signal.
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Specification