MORPHOLOGY BASED ISCHEMIA DETECTION USING INTRACARDIAC ELECTROGRAMS
First Claim
1. An apparatus comprising:
- an ambulatory cardiac signal sensing circuit configured to provide an electrical cardiac signal representative of cardiac activity of a subject;
a processor communicatively coupled to the ambulatory cardiac signal sensing circuit and including;
a feature module configured to;
identify a fiducial feature in the cardiac signal; and
locate one or more cardiac features in the cardiac signal using the fiducial feature; and
a correlation module configured to calculate a measure of similarity of morphology for a segment of the cardiac signal that includes the cardiac features; and
an ischemia detection module configured to;
detect a change in the measure of similarity; and
determine whether the detected change in the measure of similarity is indicative of ischemia and provide an indication of ischemia to a user or process according to the detected change in the measure of similarity.
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Accused Products
Abstract
An apparatus comprises an ambulatory cardiac signal sensing circuit configured to provide an electrical cardiac signal representative of cardiac activity of a subject and processor. The processor includes a feature module, a correlation module, and an ischemia detection module. The feature module is configured to identify a fiducial feature in the cardiac signal and locate one or more cardiac features in the cardiac signal using the fiducial feature. The correlation module is configured to calculate a measure of similarity of morphology for a segment of the cardiac signal that includes the cardiac features. The ischemia detection module is configured to detect a change in the measure of similarity and determine whether the detected change in the measure of similarity is indicative of ischemia.
8 Citations
20 Claims
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1. An apparatus comprising:
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an ambulatory cardiac signal sensing circuit configured to provide an electrical cardiac signal representative of cardiac activity of a subject; a processor communicatively coupled to the ambulatory cardiac signal sensing circuit and including; a feature module configured to; identify a fiducial feature in the cardiac signal; and locate one or more cardiac features in the cardiac signal using the fiducial feature; and a correlation module configured to calculate a measure of similarity of morphology for a segment of the cardiac signal that includes the cardiac features; and an ischemia detection module configured to; detect a change in the measure of similarity; and determine whether the detected change in the measure of similarity is indicative of ischemia and provide an indication of ischemia to a user or process according to the detected change in the measure of similarity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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sensing at least one cardiac signal representative of cardiac activity of a subject using an ambulatory medical device (IMD); identifying a fiducial feature in the cardiac signal; locating one or more cardiac features in the cardiac signal using the fiducial feature; calculating a measure of similarity of morphology of a segment of the cardiac signal that includes the located cardiac features; detecting a change in the calculated measure of similarity; and determining whether the detected change in the calculated measure of similarity is indicative of ischemia and providing an indication of ischemia to a user or process according to the detected change. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification