System and method for classifying cardiac depolarization complexes with multi-dimensional correlation
AssigneeCardiac Pacemakers, Inc.
InventorsRobert J. Sweeney, William Hsu
Life of this patent
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Abstract
A system and method for classifying cardiac depolarization complexes in which waveforms of a depolarization complex are sensed by separate electrodes and correlated with template waveforms of a template depolarization complex. The system is particularly suitable for incorporation into a cardiac rhythm management device such as an implantable cardioverter/defibrillator or pacemaker in order to facilitate arrhythmia prediction and/or prevention.
Claims16
A method for classifying a sensed cardiac depolarization complex, comprising:
- sensing a plurality of depolarization waveforms resulting from a cardiac depolarization complex, wherein each of the plurality of sensed waveforms is sensed with a sensing channel having a different electrode configuration, and generating digital samples of the sensed waveforms over a defined period of time to result in a sample set for each sensed waveform;
- storing the sample set of each sensed waveform in a sensed sample array and a sample set of each corresponding waveform of a template depolarization complex in a template sample array;
- computing a multi-dimensional correlation between the sensed sample arrays and the corresponding template sample arrays;
- classifying the sensed depolarization complex is as being equivalent to the template complex if the multi-dimensional correlation indicates a specified degree of similarity;
- grouping samples of the sensed and template waveforms at a particular sampling time into a sensed complex vector and template complex vector, respectively;
- and,
- adding one or more parameter features to the sensed and template complex vectors, wherein a parameter feature is defined as the deviation from a mean value of a measurable parameter related to a cardiac depolarization complex.
A cardiac rhythm management device having incorporated therein a system for classifying sensed cardiac depolarization complexes, comprising:
- a plurality of sensing channels for sensing waveforms of a cardiac depolarization complex and for converting the sensed waveforms into digitized samples, wherein each of the plurality of sensing channels has a different electrode configuration;
- a processor and associated memory interfaced to the sensing channels;
- and,
- wherein the processor is programmed to:
- store digital samples of the sensed waveforms from each of the plurality of sensed channels over a defined period of time to result in a sample set of each sensed waveform;
- store the sample set of each sensed waveform in a sensed sample array;
- store a sample set of each corresponding waveform of a template depolarization complex in a template sample array;
- compute a multi-dimensional correlation between the sensed sample arrays and the corresponding template sample arrays;
- classify the sensed depolarization complex is as being equivalent to the template complex if the multi-dimensional correlation indicates a specified degree of similarity;
- group samples of the sensed and template waveforms at a particular sampling time into a sensed complex vector and template complex vector, respectively;
- and,
- add one or more parameter features to the sensed and template complex vectors, wherein a parameter feature is defined as the deviation from a mean value of a measurable parameter related to a cardiac depolarization complex.
Dependencies are inferred from the claim text.