Physiological event detection systems and methods
First Claim
1. A method comprising:
- determining a first distribution of values for a first physiological parameter, the first distribution of values determined using physiological data collected by a physiological sensor of an implantable medical device;
determining one or more values corresponding to at least a first tail area of the first distribution, the first tail area extending from at least one measurement of the first physiological parameter toward an end point of the distribution;
receiving a specified false alarm rate;
establishing a threshold based on the specified false alarm rate and the first distribution of values, the threshold value changing according to a change in the first distribution of values;
comparing the one or more values to the threshold; and
determining that the measurement is representative of a detected event using the comparison.
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Abstract
Systems and methods using constant false alarm rate techniques for event detection. One example of an event detection method includes collecting a first distribution of measurements for a first physiological parameter. In another example, the first distribution of measurements includes only non-event measurements. One or more values are determined corresponding to at least a first tail area of the first distribution from at least one measurement of the first physiological parameter toward an end point of the distribution. A threshold is established based on a specified false alarm rate. The one or more values are compared to the threshold. The method includes determining if the measurement is representative of a detected event using the comparison.
45 Citations
29 Claims
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1. A method comprising:
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determining a first distribution of values for a first physiological parameter, the first distribution of values determined using physiological data collected by a physiological sensor of an implantable medical device; determining one or more values corresponding to at least a first tail area of the first distribution, the first tail area extending from at least one measurement of the first physiological parameter toward an end point of the distribution; receiving a specified false alarm rate; establishing a threshold based on the specified false alarm rate and the first distribution of values, the threshold value changing according to a change in the first distribution of values; comparing the one or more values to the threshold; and determining that the measurement is representative of a detected event using the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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using a first distribution representative of measurements for a first physiological parameter, the first distribution collected by a physiological sensor of an implantable medical device; receiving a specified false alarm rate; computing an event detection threshold value based on the specified false alarm rate and the first distribution, the threshold value changing according to a change in the first distribution of values, and the event detection threshold value corresponds to a first tail area of the first distribution extending from the event detection threshold value toward an end point of the first distribution; obtaining a measurement of the first physiological parameter with the implantable medical device; comparing the measurement of the first physiological parameter to the event detection threshold value; and declaring the measurement as representative of a detected event if the measurement falls within the tail area. - View Dependent Claims (11, 12)
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13. A method comprising:
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determining a first distribution of measurements for a first physiological parameter, the first distribution of measurements determined using physiological data collected by a physiological sensor of an implantable medical device; determining a first value corresponding to a first tail area of the first distribution, the first tail area extending from a first physiological parameter measurement toward an end point of the first distribution; determining a second distribution of measurements for a second physiological parameter, the second distribution of measurements determined by the implantable medical device, and the second physiological parameter is different from the first physiological parameter; determining a second value corresponding to a second tail area of the second distribution, the second tail area extending from a second physiological parameter measurement toward an end point of the second distribution; combining the first value with the second value to form a joint metric where the first value and second values are based on their respectively different first and second physiological parameters; receiving a specified false alarm rate; establishing a shared common threshold based on a specified false alarm rate; comparing the joint metric including the combined first and second values with the shared common threshold; and determining that the first and second physiological parameter measurements are representative of a detected event using the comparison. - View Dependent Claims (14)
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15. A method comprising:
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determining a first distribution of measurements for a first physiological parameter, the first distribution of measurements determined using physiological data collected by a physiological sensor of an implantable medical device; determining at least one composite measurement based on the distribution; determining at least one threshold value based on the composite measurement; comparing at least a first measurement with the threshold value; counting the first measurement if the measurement equals or exceeds the threshold value; receiving at least one specified false alarm rate; comparing the count against the at least one specified false alarm rate; and determining whether the count is representative of a detected event using the comparison. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus comprising:
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an implantable medical device comprising; a physiological sensor to collect at least a first distribution of measurements for a first physiological parameter; and a processor circuit comprising; a value determination module to determine one or more values corresponding to at least a first tail area of the first distribution of the first physiological parameter toward an end point of the distribution, a comparator to compare the one or more values with a threshold, the threshold based on a specified false alarm rate and the first distribution of measurements, the threshold value changing according to a change in the first distribution of measurements, and an event indicator to provide an event indication if the one or more values is representative of a detected event using the comparison. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification