CARDIAC RATE TRACKING IN AN IMPLANTABLE MEDICAL DEVICE
First Claim
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1. A method of operation in an implantable cardiac device comprising:
- analyzing cardiac data using a rate estimation method iteratively over time to yield a series of cardiac rate estimates;
determining that the series of cardiac rate estimates establishing a first cardiac rate track; and
following establishment of the first cardiac rate track, attempting a particular iteration of the rate estimation method and;
determining that the cardiac data of the particular iteration fails to provide a cardiac rate; and
interpolating a cardiac rate estimate using the first track.
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Abstract
Self-correlation enhancements and implementations are described. In particular, certain examples demonstrate the use of a tracking mechanism to identify and/or confirm cardiac rate using data from iterative self-correlation performed at intervals over time. This may enable the interpolation of cardiac rate in an implantable medical device when data is insufficient, and may provide confidence in cardiac rate analyses.
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Citations
20 Claims
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1. A method of operation in an implantable cardiac device comprising:
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analyzing cardiac data using a rate estimation method iteratively over time to yield a series of cardiac rate estimates; determining that the series of cardiac rate estimates establishing a first cardiac rate track; and following establishment of the first cardiac rate track, attempting a particular iteration of the rate estimation method and; determining that the cardiac data of the particular iteration fails to provide a cardiac rate; and interpolating a cardiac rate estimate using the first track. - View Dependent Claims (2, 3, 4, 5)
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6. A method of cardiac signal analysis in an implantable medical device system comprising a plurality of electrodes for sensing cardiac signals coupled to operational circuitry configured to analyze signals generated by the plurality of electrodes, the method comprising:
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sensing cardiac signals using the plurality of electrodes; iteratively performing a self-correlation to generate a self-correlation function using the sensed cardiac signals; for a plurality of iterations of the self-correlation, identifying peaks in the self-correlation function to yield a first estimate of cardiac rate and first affiliated confidence having ratings of at least low or high confidence, except if no peak can be identified sufficient to yield an estimate of cardiac rate; tracking peaks and cardiac rate estimates generated by the identifying peaks step over time to yield a second estimate of cardiac rate with second affiliated confidence having ratings of at least low, medium or high confidence, in which the second estimate of cardiac rate may or may not match the first estimate of cardiac rate; and using the first and second estimated cardiac rates and affiliated first and second confidences to decide whether a cardiac therapy is warranted. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of cardiac signal analysis in an implantable medical device system comprising a plurality of electrodes for sensing cardiac signals coupled to operational circuitry configured to analyze signals generated by the plurality of electrodes, the method comprising:
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sensing cardiac signals using the plurality of electrodes; iteratively performing a self-correlation to generate a self-correlation function using the sensed cardiac signals; for a plurality of iterations of the self-correlation, identifying peaks in the self-correlation function to yield a first estimate of cardiac rate and one or more possible cardiac rates, except if no peak can be identified sufficient to yield an estimate of cardiac rate; tracking peaks and cardiac rate estimates generated by the identifying peaks step over time to yield a second estimate of cardiac rate with an affiliated confidence having ratings of at least low, medium or high confidence; and using the second estimated cardiac rate and affiliated confidence to decide whether a cardiac therapy is warranted. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification