Rejecting oversensing due to noise
First Claim
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1. A method comprising:
- sensing a signal indicative of cardiac activity;
detecting a cardiac event based on the signal;
determining a count of fluctuations of the signal within a window between the detected cardiac event and a next cardiac event; and
determining whether noise is present in the signal based on the count,wherein determining the count of fluctuations of the signal comprises;
monitoring a characteristic of the signal within the window between the detected cardiac event and the next cardiac event,determining a threshold signal based on the monitored characteristic of the signal,comparing values of the signal to values of the threshold signal, andincrementing a counter that indicates the count of fluctuations based on the comparison.
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Abstract
In general, this disclosure is directed to signal processing based methods to reject oversensing due to electromagnetic interference or other noise without compromising tachyarrhythmia detection sensitivity. A method comprises sensing a signal indicative of cardiac activity, detecting a cardiac event based on the signal, determining a count of fluctuations of the signal within a window between the detected cardiac event and a next cardiac event, and determining whether noise is present in the signal based on the count.
21 Citations
26 Claims
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1. A method comprising:
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sensing a signal indicative of cardiac activity; detecting a cardiac event based on the signal; determining a count of fluctuations of the signal within a window between the detected cardiac event and a next cardiac event; and determining whether noise is present in the signal based on the count, wherein determining the count of fluctuations of the signal comprises; monitoring a characteristic of the signal within the window between the detected cardiac event and the next cardiac event, determining a threshold signal based on the monitored characteristic of the signal, comparing values of the signal to values of the threshold signal, and incrementing a counter that indicates the count of fluctuations based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system comprising:
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a sensor that senses a signal indicative of cardiac activity; a sensing module that detects a cardiac event based on the signal, wherein the sensing module is adapted to determine a count of fluctuations of the signal within a window between the detected cardiac event and a next cardiac event; and a processor that determines whether noise is present in the signal based on the count, wherein the sensing module; monitors a characteristic of the signal within the window between the detected cardiac event and the next cardiac event; determines a threshold signal based on the monitored characteristic of the signal; compares values of the signal to values of the threshold signal; and increments a counter indicating the count of fluctuations based on the comparison. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system comprising:
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means for sensing a signal indicative of cardiac activity; means for detecting a cardiac event based on the signal; means for determining a count of fluctuations of the signal within a window between the detected cardiac event and a next cardiac event; and means for determining whether noise is present in the signal based on the count, wherein the means for determining the count of fluctuations of the signal comprises; means for monitoring a characteristic of the signal within the window between the detected cardiac event and the next cardiac event, means for determining a threshold signal based on the monitored characteristic of the signal, means for comparing values of the signal to values of the threshold signal, and means for incrementing a counter that indicates the count of fluctuations based on the comparison.
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26. A non-transitory computer readable medium comprising instructions, wherein the instructions cause a programmable processor to:
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receive a signal indicative of cardiac activity; detect a cardiac event based on the signal; determine a count of fluctuations of the signal within a window between the detected cardiac event and a next cardiac event; and determine whether noise is present in the signal based on the count, wherein the instructions that cause the processor to determine the count of fluctuations of the signal comprise instructions that cause the processor to; monitor a characteristic of the signal within the window between the detected cardiac event and the next cardiac event, determine a threshold signal based on the monitored characteristic of the signal, compare values of the signal to values of the threshold signal, and increment a counter that indicates the count of fluctuations based on the comparison.
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Specification