PHYSIOLOGICAL EVENT DETECTION SYSTEMS AND METHODS
First Claim
1. A method comprising:
- determining a first distribution of values for a first physiological parameter;
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;
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.
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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;
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;
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;
receiving a specified false alarm rate;
computing an event detection threshold value based on the specified false alarm rate for the first distribution, 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;
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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collecting a first distribution of measurements for a first physiological parameter;
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;
collecting a second distribution of measurements for a second 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;
receiving a specified false alarm rate;
establishing a threshold based on a specified false alarm rate;
comparing the joint metric with the 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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collecting a first distribution of measurements for a first physiological parameter;
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 an event indicator to provide an event indication if the measurement 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