Method and apparatus for characterizing cardiac tissue from local electrograms
First Claim
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1. A method of characterizing a property of cardiac tissue at a local site of a heart based of a local electrogram measured at said local site, said method comprising the steps of:
- (a) normalizing said local electrogram, wherein said normalizing comprises;
(i) annotating said electrogram;
(ii) selecting a single cardiac cycle from said electrogram; and
(iii) representing said cardiac cycle of said electrogram as a vector such that said annotation is at a fixed position within said vector;
(b) extracting a feature vector from said normalized local electrogram; and
(c) classifying said property of said cardiac tissue at said local site based on said feature vector.
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Abstract
The property of cardiac tissue at a local site, a plurality of sites of in a region of a heart may be characterized based on local electrograms measured at the local site, at a plurality of sites or in the region, respectively. The property may be characterized by normalizing the local electrogram, extracting a feature vector from the normalized electrogram, and classifying the tissue property based on the feature vector. The method of may further include computing a map of the tissue property and treating the tissue based on the resultant map. Apparatus to characterize the property includes a catheter and a processor to normalize the local electrogram, extract the feature vector from the electrogram and classify the tissue based on the feature vector.
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Citations
53 Claims
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1. A method of characterizing a property of cardiac tissue at a local site of a heart based of a local electrogram measured at said local site, said method comprising the steps of:
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(a) normalizing said local electrogram, wherein said normalizing comprises;
(i) annotating said electrogram;
(ii) selecting a single cardiac cycle from said electrogram; and
(iii) representing said cardiac cycle of said electrogram as a vector such that said annotation is at a fixed position within said vector;
(b) extracting a feature vector from said normalized local electrogram; and
(c) classifying said property of said cardiac tissue at said local site based on said feature vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31, 32)
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16. A method of characterizing a property of cardiac tissue at a plurality of local sites of a heart based on a plurality of local electrograms, said method comprising the steps of:
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(a) normalizing said local electrograms, wherein said normalizing comprises;
(i) annotating said electrograms;
(ii) selecting single cardiac cycle from each of said electrograms;
(iii) representing said single cardiac cycle of each of said electrograms as a vector such that said annotation is at a fixed position within said vectors;
(b) extracting feature vectors from said normalized local electrograms;
(c) classifying said property of said cardiac tissue at said plurality of local sites based on said feature vectors. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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33. A method of characterizing a property of a region of cardiac tissue of a heart based on plurality of local electrograms measured in said region, said method comprising the steps of:
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(a) normalizing said local electrograms, wherein said normalizing comprises;
(i) annotating said electrograms;
(ii) selecting a single cardiac cycle from each of said electrograms; and
(iii) representing said cardiac cycle of each of said electrograms as a vector such that said annotation is at a fixed position within said vector;
(b) computing a representative electrogram of said region from said normalized electrograms;
(c) extracting a representative future vector from said representative electrogram;
(d) classifying said property of said cardiac tissue at said region based on said representative feature vector. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. Apparatus for characterizing a property of cardiac tissue at a local site of a heart based on local electrogram measured at said site, said apparatus comprising:
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(a) a catheter; and
(b) a processor having signal processing circuits, the signal processing circuits performing the functions of;
(i) normalizing said electrogram;
(ii) extracting a feature vector from said normalized electrogram; and
(iii) classifying said property of said cardiac tissue at said local site based on said feature vector; and
(iv) computing a map of said property of said tissue of said heart. - View Dependent Claims (51, 52, 53)
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Specification
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Current AssigneeArmin Schwartzman, Daniel Reisfeld
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Original AssigneeArmin Schwartzman, Daniel Reisfeld
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InventorsReisfeld, Daniel, Schwartzman, Armin
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Primary Examiner(s)LAYNO, CARL HERNANDZ
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Application NumberUS09/934,476Publication NumberTime in Patent Office972 DaysField of Search600/509, 600/512, 600/518, 607/4, 607/5, 607/9US Class Current600/509CPC Class CodesA61B 5/287 Holders for multiple electr...A61B 5/341 Vectorcardiography [VCG]A61B 5/349 Detecting specific paramete...A61B 5/7267 involving training the clas...G16H 50/70 for mining of medical data,...
