Physiological event detection systems and methods
First Claim
1. A non-transitory device readable medium, comprising instructions that when performed by the device, cause the device to perform acts comprising:
- forming a distribution of values of a first physiological parameter using the first physiological parameter and a second physiological parameter measured with one or more physiological sensors of a medical device;
receiving a specified false alarm rate;
computing an event detection threshold with a processor of the medical device, the event detection threshold is based on the specified false alarm rate and the distribution of values of the first physiological parameter, the processor changing the event detection threshold according to a change in the distribution of values;
obtaining a measurement of the first physiological parameter with one or more of the physiological sensors of the medical device;
comparing the measurement of the first physiological parameter to the event detection threshold; and
generating an indication 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
22 Claims
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1. A non-transitory device readable medium, comprising instructions that when performed by the device, cause the device to perform acts comprising:
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forming a distribution of values of a first physiological parameter using the first physiological parameter and a second physiological parameter measured with one or more physiological sensors of a medical device; receiving a specified false alarm rate; computing an event detection threshold with a processor of the medical device, the event detection threshold is based on the specified false alarm rate and the distribution of values of the first physiological parameter, the processor changing the event detection threshold according to a change in the distribution of values; obtaining a measurement of the first physiological parameter with one or more of the physiological sensors of the medical device; comparing the measurement of the first physiological parameter to the event detection threshold; and generating an indication 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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screening a first distribution of values for a first physiological parameter according to a second physiological parameter, the first and second physiological parameters are measured with one or more physiological sensors of a medical device; establishing an event detection threshold with a processor of the medical device, the event detection threshold based on a specified false alarm rate and the screened first distribution of values, the processor changing the event detection threshold according to changes in the first distribution of values; obtaining a measurement of the first physiological parameter with one or more of the physiological sensors of a medical device; comparing the measurement to the event detection threshold; and generating an indication representative of a detected event using the comparison. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An apparatus comprising:
a processor circuit comprising; a distribution forming circuit configured to form a distribution of measurements of a first physiological parameter screened with a second physiological parameter, a comparator configured to compare a measurement of the first physiological parameter with a threshold, the threshold based on a specified false alarm rate and the distribution of measurements, the threshold changing according to changes in the distribution of measurements, and an event indicator configured to provide an event indication if the measurement is representative of a detected event using the comparison. - View Dependent Claims (18, 19, 20, 21, 22)
Specification