ROBUST RATE CALCULATION IN AN IMPLANTABLE CARDIAC STIMULUS OR MONITORING DEVICE
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Abstract
Devices and methods for analyzing cardiac signal data. An illustrative method includes identifying a plurality of detected events and measuring intervals between the detected events for use in rate estimation. In the illustrative embodiment, a set of intervals is used to make the rate estimation by first discarding selected intervals from the set. The remaining intervals are then used to calculate an estimated interval, for example by averaging the remaining intervals.
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Citations
12 Claims
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1. (canceled)
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2. An implantable cardiac system for monitoring or treating a patient'"'"'s heart, the implantable cardiac system including at least a plurality of implantable electrodes and operational circuitry coupled to the electrodes for performing cardiac signal analysis, in which the operational circuitry is configured to perform a cardiac signal analysis comprising:
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sensing a signal using the implantable electrodes; detecting events in the sensed signal, the detected events separated by intervals; at a first time, using a first method to estimate a heart rate for the patient using information related to the detected events; comparing the heart rate for the patient estimated using the first method to a rate threshold and determining that the threshold has been crossed; at a second time after determining that the rate threshold has been crossed, using a second, different method to estimate the heart rate for the patient. - View Dependent Claims (3, 4)
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5. An implantable cardiac system for monitoring or treating a patient'"'"'s heart, the implantable cardiac system including at least a plurality of implantable electrodes and operational circuitry coupled to the electrodes for performing cardiac signal analysis, in which the operational circuitry is configured to perform a cardiac signal analysis comprising:
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sensing a signal using the implantable electrodes; detecting a series of events in the sensed signal, the series of events separated by intervals, to obtain a set of intervals; within the set of intervals, selecting a shortest interval and generating a limited set of intervals that excludes the shortest interval; and estimating a cardiac rate of the patient using the intervals in the limited set of intervals; wherein the step of estimating a cardiac rate includes calculating a weighted average of the intervals in the limited set of intervals. - View Dependent Claims (6, 7, 8)
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9. An implantable cardiac system for monitoring or treating a patient'"'"'s heart, the implantable cardiac system including at least a plurality of implantable electrodes and operational circuitry coupled to the electrodes for performing cardiac signal analysis, in which the operational circuitry is configured to perform a cardiac signal analysis comprising:
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sensing a signal using the implantable electrodes; detecting a series of events in the sensed signals, the series of events separated by intervals, to obtain a set of intervals; selecting a first set of intervals for a first rate calculation; performing a first rate calculation by obtaining a mean and error measure for the first set of intervals and using the mean less the error measure to estimate cardiac rate for the patient. - View Dependent Claims (10, 11, 12)
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Specification