Cardiac pacing response classification using an adaptable classification interval
First Claim
1. A method of operating a cardiac medical device to automatically form a cardiac response classification interval during which a cardiac signal is sensed to determine a cardiac response of a heart to pacing, the method comprising:
- sensing one or more cardiac signals associated with a type of cardiac pacing response;
determining timing variability of one or more features of the cardiac signals;
forming the cardiac response classification interval including temporally orienting the classification interval with respect to timing of the one or more cardiac signal features, and setting a duration of the classification interval using the timing variability of the one or more cardiac signal features;
determining the cardiac response to pacing using the classification interval;
delivering pacing therapy to the heart based on determination of the cardiac pacing response; and
determining whether a predetermined stability criterion has been achieved based on the variability of a parameter of the cardiac response classification interval being below a predetermined value;
wherein forming the cardiac response classification interval comprises adapting an upper or lower bound of the classification interval until the predetermined stability criterion is determined to be achieved.
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Abstract
Methods and systems involve the formation of a classification interval used for sensing a cardiac signal following a pacing pulse to determine a cardiac response to pacing. One or more cardiac signals associated with a type of cardiac pacing response are sensed. The timing of at least one feature of the cardiac signal may be used to define an initial cardiac response classification interval. The classification interval is adapted based on the variability of the timing of the feature. The classification interval may be adapted using a predetermined number of additional cardiac signals or until a predetermined stability criterion is achieved.
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Citations
19 Claims
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1. A method of operating a cardiac medical device to automatically form a cardiac response classification interval during which a cardiac signal is sensed to determine a cardiac response of a heart to pacing, the method comprising:
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sensing one or more cardiac signals associated with a type of cardiac pacing response; determining timing variability of one or more features of the cardiac signals; forming the cardiac response classification interval including temporally orienting the classification interval with respect to timing of the one or more cardiac signal features, and setting a duration of the classification interval using the timing variability of the one or more cardiac signal features; determining the cardiac response to pacing using the classification interval; delivering pacing therapy to the heart based on determination of the cardiac pacing response; and determining whether a predetermined stability criterion has been achieved based on the variability of a parameter of the cardiac response classification interval being below a predetermined value; wherein forming the cardiac response classification interval comprises adapting an upper or lower bound of the classification interval until the predetermined stability criterion is determined to be achieved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18)
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10. A medical system, comprising:
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a pacing circuit configured to deliver pacing pulses to a heart chamber; a sensing circuit configured to sense cardiac signals associated with the pacing pulses; a processor coupled to the sensing circuit, the processor configured to determine a cardiac response classification interval defining a period of time after a pacing pulse that a cardiac signal is sensed to determine a response to the pacing pulse, the processor configured to temporally orient the classification interval with respect to timing of at least one cardiac signal feature, and to determine a duration of the classification interval based on a timing variability of the at least one cardiac signal feature, the cardiac signal feature associated with a type of cardiac pacing response; and cardiac response classification circuitry configured to determine a cardiac response to pacing using the classification interval, wherein the pacing circuit is configured to deliver pacing therapy based at least in part on determination of the cardiac pacing response; wherein the processor is further configured to determine the variability of a parameter of the cardiac response classification interval, determine whether a predetermined stability criterion has been achieved based on the variability of the parameter of the cardiac response classification interval being below a predetermined value, and adapt the cardiac response classification interval until the stability criterion is determined to be achieved. - View Dependent Claims (11, 12, 13, 14, 19)
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15. A system for forming a cardiac response classification interval used for sensing a cardiac signal following a pacing pulse to determine a response to the pacing pulse, comprising:
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means for sensing cardiac signals associated with a type of cardiac pacing response; means for determining a variability of a timing of one or more features of the cardiac signals; means for forming the cardiac response classification interval including temporally orienting the classification interval with respect to the timing of the one or more features, and setting a duration of the classification interval using the timing variability; means for determining a cardiac pacing response using the cardiac response classification interval; pacing circuitry configured to deliver pacing therapy based at least in part on determination of the cardiac pacing response; and means for determining whether a predetermined stability criterion has been achieved based on comparison of a predetermined value to the variability of a parameter of the cardiac response classification interval; wherein the forming means also adapts an upper or lower bound of the classification interval until the predetermined stability criterion is determined to be achieved. - View Dependent Claims (16, 17)
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Specification