Methods and devices for accurately classifying cardiac activity
First Claim
1. A method of cardiac signal analysis in an implantable medical device (IMD), the IMD including a number of implantable electrodes and operational circuitry coupled to the implantable electrodes for performing the method of cardiac signal analysis, the method comprising:
- a) the operational circuitry detecting events in a signal captured using the implantable electrodes;
b) the operational circuitry determining which detected events to certify for use in rhythm identification by;
i) applying analysis of the morphology of a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified;
ii) applying analysis to pairs of consecutive events to identify overdetected events using interval and shape characteristics such that, if a likely overdetection is identified, the likely overdetection is not certified;
iii) certifying at least some detected events of the set of detected events; and
iv) using only certified events to calculate a rate for the patient;
c) the operational circuitry determining whether a malignant cardiac rhythm is occurring using certified detected events;
wherein the operational circuitry is configured to perform certification in b) even when no arrhythmia has been identified.
1 Assignment
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 illustrative 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. New methods for organizing the use of morphology and rate analysis in an overall architecture for rhythm classification and cardiac signal analysis are also discussed.
-
Citations
10 Claims
-
1. A method of cardiac signal analysis in an implantable medical device (IMD), the IMD including a number of implantable electrodes and operational circuitry coupled to the implantable electrodes for performing the method of cardiac signal analysis, the method comprising:
-
a) the operational circuitry detecting events in a signal captured using the implantable electrodes; b) the operational circuitry determining which detected events to certify for use in rhythm identification by; i) applying analysis of the morphology of a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified; ii) applying analysis to pairs of consecutive events to identify overdetected events using interval and shape characteristics such that, if a likely overdetection is identified, the likely overdetection is not certified; iii) certifying at least some detected events of the set of detected events; and iv) using only certified events to calculate a rate for the patient; c) the operational circuitry determining whether a malignant cardiac rhythm is occurring using certified detected events; wherein the operational circuitry is configured to perform certification in b) even when no arrhythmia has been identified. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An implantable cardiac stimulus device (ICSD) comprising electrodes for capturing data from a recipient of the ICSD and operational circuitry coupled to the electrodes to analyze signal captured from the patient, wherein the operational circuitry is configured to perform a method comprising the following steps:
-
a) detecting events in a signal captured with the electrodes; b) determining which detected events to certify for use in rhythm identification by; i) applying analysis of the morphology of a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified; ii) applying analysis to identify overdetected events using interval and shape characteristics of pairs of consecutive events such that, if a likely overdetection is identified, the likely overdetection is not certified; iii) certifying at least some detected events of the set of detected events; and iv) calculating a cardiac rate using only the certified events; c) determining whether a malignant cardiac rhythm is occurring using certified detected events; wherein the operational circuitry is configured to perform certification in b) even when no arrhythmia has been identified. - View Dependent Claims (7, 8, 9, 10)
-
Specification