Data manipulation following delivery of a cardiac stimulus in an implantable cardiac stimulus device
First Claim
1. A method of cardiac signal analysis in an implantable cardiac stimulus device (ICSD) having electrodes adapted for implantation into a patient'"'"'s body, the method comprising:
- capturing cardiac signal data from a patient using the electrodes;
identifying cardiac events in the cardiac signal data;
estimating peak amplitudes in a plurality of the identified cardiac events;
estimating a rate of cardiac events from the identified cardiac events; and
determining whether cardiac stimulus is indicated using at least reference to the estimated rate and, if so delivering cardiac stimulus;
wherein the step of identifying cardiac events is performed by comparing the captured cardiac signal data to a detection threshold, wherein;
by default the detection threshold is mathematically related to the most recent estimated peak amplitude; and
after delivery of cardiac stimulus, the detection threshold is mathematically related to a predetermined value unrelated to the most recent estimated peak.
0 Assignments
0 Petitions
Accused Products
Abstract
Methods of cardiac rhythm analysis in an implantable cardiac stimulus device, and devices configured for such methods. In an illustrative embodiment, certain data relating to cardiac event rate or amplitude is modified following delivery of a cardiac stimulus. In another embodiment, cardiac rhythm analysis is performed using one of plural states, with the plural states using different criteria, such as a detection threshold, to detect cardiac events in a sensed signal. Following delivery of a cardiac stimulus, data is manipulated to force the analysis into one of the states, where stimulus is delivered, in the illustrative embodiment, only after a different state is invoked. Implantable devices incorporating operational circuitry for performing such methods are also included in other illustrative embodiments.
247 Citations
10 Claims
-
1. A method of cardiac signal analysis in an implantable cardiac stimulus device (ICSD) having electrodes adapted for implantation into a patient'"'"'s body, the method comprising:
-
capturing cardiac signal data from a patient using the electrodes; identifying cardiac events in the cardiac signal data; estimating peak amplitudes in a plurality of the identified cardiac events; estimating a rate of cardiac events from the identified cardiac events; and determining whether cardiac stimulus is indicated using at least reference to the estimated rate and, if so delivering cardiac stimulus; wherein the step of identifying cardiac events is performed by comparing the captured cardiac signal data to a detection threshold, wherein; by default the detection threshold is mathematically related to the most recent estimated peak amplitude; and after delivery of cardiac stimulus, the detection threshold is mathematically related to a predetermined value unrelated to the most recent estimated peak. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An implantable cardiac stimulus device (ICSD) comprising a plurality of electrodes for cardiac electrical sensing and/or therapy delivery;
- operational circuitry coupled to the plurality of electrodes including therapy delivery circuitry for delivering electrical cardiac therapy via the electrodes and analysis circuitry for analyzing cardiac signals in conjunction with processing circuitry, wherein the operational circuitry is configured to perform cardiac signal analysis and treatment as follows;
capturing cardiac signal data from a patient using the electrodes; identifying cardiac events in the cardiac signal data; estimating peak amplitudes in a plurality of the identified cardiac events; estimating a rate of cardiac events from the identified cardiac events; and determining whether cardiac stimulus is indicated using reference to the estimated rate and, if so delivering cardiac stimulus; wherein the operational circuitry is configured such that the step of identifying cardiac events is performed by comparing the captured cardiac signal data to a detection threshold, wherein; by default the detection threshold is mathematically related to the most recent estimated peak amplitude; and after delivery of cardiac stimulus, the detection threshold is mathematically related to a predetermined value unrelated to the most recent estimated peak amplitude. - View Dependent Claims (7, 8, 9, 10)
- operational circuitry coupled to the plurality of electrodes including therapy delivery circuitry for delivering electrical cardiac therapy via the electrodes and analysis circuitry for analyzing cardiac signals in conjunction with processing circuitry, wherein the operational circuitry is configured to perform cardiac signal analysis and treatment as follows;
Specification