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) comprising:
- sensing electrical cardiac signals captured from implanted electrodes to analyze the cardiac rhythm of a patient;
determining that the cardiac rhythm of the patient is malignant and indicates cardiac stimulus, including determining that the patient has a cardiac rate in an arrhythmic range predefined by the ICSD;
delivering an indicated cardiac stimulus to the patient; and
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following the delivery of the cardiac stimulus;
forcing the ICSD to calculate a recorded cardiac rate in a non-arrhythmic range by modifying stored data related to the timing of cardiac events; and
using the modified stored data to determine parameters for further sensing of cardiac signals following the delivery of the cardiac stimulus.
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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.
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Citations
21 Claims
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1. A method of cardiac signal analysis in an implantable cardiac stimulus device (ICSD) comprising:
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sensing electrical cardiac signals captured from implanted electrodes to analyze the cardiac rhythm of a patient; determining that the cardiac rhythm of the patient is malignant and indicates cardiac stimulus, including determining that the patient has a cardiac rate in an arrhythmic range predefined by the ICSD; delivering an indicated cardiac stimulus to the patient; and
;following the delivery of the cardiac stimulus; forcing the ICSD to calculate a recorded cardiac rate in a non-arrhythmic range by modifying stored data related to the timing of cardiac events; and using the modified stored data to determine parameters for further sensing of cardiac signals following the delivery of the cardiac stimulus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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;
sensing electrical cardiac signals captured from the electrodes to analyze the cardiac rhythm of a patient; determining that the cardiac rhythm of the patient is malignant and indicates cardiac stimulus, including determining that the patient has a cardiac rate in an arrhythmic range predefined by the ICSD; delivering an indicated cardiac stimulus to the patient via the electrodes; and
;following the delivery of the cardiac stimulus; forcing the ICSD to calculate a recorded cardiac rate in a non-arrhythmic range by modifying stored data related to the timing of cardiac events; and using the modified stored data to determine parameters for further sensing of cardiac signals following the delivery of the cardiac stimulus. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
- 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