Methods and Devices for Accurately Classifying Cardiac Activity
First Claim
1. A method of cardiac signal analysis in an implantable medical device comprising:
- a) detecting events in a signal;
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; and
ii) applying interval analysis on 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;
c) determining whether a malignant cardiac rhythm is occurring using certified detected events; and
d) delivering therapy in response to the malignant rhythm.
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.
133 Citations
34 Claims
-
1. A method of cardiac signal analysis in an implantable medical device comprising:
-
a) detecting events in a signal; 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; and ii) applying interval analysis on 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; c) determining whether a malignant cardiac rhythm is occurring using certified detected events; and d) delivering therapy in response to the malignant rhythm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of cardiac signal analysis in an implantable medical device comprising:
-
a) detecting events in a signal; 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; and 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; c) determining whether a malignant cardiac rhythm is occurring using certified detected events; and d) delivering therapy in response to the malignant rhythm. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A method of cardiac signal analysis in an implantable medical device comprising:
-
a) detecting events in a signal; b) determining which detected events to certify for use in rhythm identification by; i) applying interval analysis on 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; and 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; c) determining whether a malignant cardiac rhythm is occurring using certified detected events; and d) delivering therapy in response to the malignant rhythm. - View Dependent Claims (14, 15, 16, 17)
-
-
18. 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; 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; and ii) applying interval analysis on 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; c) determining whether a malignant cardiac rhythm is occurring using certified detected events; and d) delivering therapy in response to the malignant rhythm. - View Dependent Claims (19, 20, 21, 22, 23, 24)
-
-
25. 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; 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; and 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; c) determining whether a malignant cardiac rhythm is occurring using certified detected events; and d) delivering therapy in response to the malignant rhythm. - View Dependent Claims (26, 27, 28, 29)
-
-
30. 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; b) determining which detected events to certify for use in rhythm identification by; i) applying interval analysis on 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; and 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; c) determining whether a malignant cardiac rhythm is occurring using certified detected events; and d) delivering therapy in response to the malignant rhythm.
-
-
31. The ICSD of claim 31 wherein the operational circuitry is further configured such that the method further comprises performing waveform appraisal on detected events and, for each event, either passing the detected event or marking the detected event as suspect, wherein step b) is performed only on detected events that pass waveform appraisal;
- wherein waveform appraisal operates to determine whether a detected event is noisy and, if so, to prevent any noisy detected events from passing further into the analysis.
- View Dependent Claims (32, 33, 34)
Specification