Methods and Devices for Accurately Classifying Cardiac Activity
0 Assignments
0 Petitions
Accused Products
Abstract
Methods, systems, and devices for signal analysis in an implanted cardiac monitoring and treatment device such as an implantable cardioverter defibrillator. In some examples, captured data including detected events is analyzed to identify likely overdetection of cardiac events. In some illustrative examples, when overdetection is identified, data may be modified to correct for overdetection, to reduce the impact of overdetection, or to ignore overdetected data. Several examples emphasize the use of morphology analysis using correlation to static templates and/or inter-event correlation analysis.
2 Citations
21 Claims
-
1. (canceled)
-
2. An implantable cardiac stimulus (ICS) system comprising a canister housing operational circuitry for the ICS system and a plurality of electrodes configured for implantation in a patient and for coupling to the operational circuitry, wherein the operational circuitry is configured to perform a method comprising:
-
capturing cardiac signals occurring within a patient; detecting electrical events in the captured cardiac signals; identifying an event representation for one of the detected electrical events; comparing the event representation to a template having a template fiducial point by identifying an event fiducial point and aligning the template fiducial point and the event fiducial point to one another and calculating a first correlation between the event representation and the template when so aligned; again comparing the first event representation to the template, this time by selecting a different alignment of the template and event fiducial points to yield a second correlation; selecting from at least the first correlation or the second correlation whichever indicates greater correlation as the correlation result for the one of the detected electrical events; and using the correlation result to determine whether the patient has a cardiac condition which requires therapy. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of operation in an implantable cardiac device system comprising a canister housing operational circuitry and a plurality of electrodes coupled to the operational circuitry, the method comprising:
-
capturing cardiac signals occurring within a patient; detecting electrical events in the captured cardiac signals; identifying an event representation for one of the detected electrical events; comparing the event representation to a template having a template fiducial point by identifying an event fiducial point and aligning the template fiducial point and the event fiducial point to one another and calculating a first correlation between the event representation and the template when so aligned; again comparing the first event representation to the template, this time by selecting a different alignment of the template and event fiducial points to yield a second correlation; selecting from at least the first correlation or the second correlation whichever indicates greater correlation as the correlation result for the one of the detected electrical events; and using the correlation result to determine whether the patient has a cardiac condition which requires therapy. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification