Reducing nuisance alarms
First Claim
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1. A method performed by a pulse oximeter comprising a processor and a memory, the method comprising:
- calculating an estimated value of an oxygen saturation of a patient'"'"'s blood from information received from a sensor;
calculating a probability distribution of an actual value of the oxygen saturation of the patient'"'"'s blood based at least in part upon information received from the sensor;
calculating, by the pulse oximeter, an adjusted threshold based at least in part upon the probability distribution and a predetermined threshold, wherein when the estimated value of oxygen saturation exceeds the adjusted threshold an alarm is indicated;
determining that the estimated value of the oxygen saturation exceeds the adjusted threshold;
determining, by the pulse oximeter, whether an accuracy of the estimated value has recently degraded by comparing a current accuracy of the estimated value to a previous accuracy of the estimated value; and
delaying generating, by the pulse oximeter, the alarm based at least in part upon determining that the accuracy of the estimated value has recently degraded.
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Abstract
Embodiments disclosed herein may describe systems and methods for reducing nuisance alarms using probability and/or accuracy of a measured physiological parameter, such as the pulse rate or SpO2 measurement generated by a pulse oximeter. Embodiments may include methods for adjusting a predetermined alarm threshold based on the probability distribution of the estimated pulse rate and/or oxygen saturation of a patient'"'"'s blood.
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Citations
7 Claims
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1. A method performed by a pulse oximeter comprising a processor and a memory, the method comprising:
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calculating an estimated value of an oxygen saturation of a patient'"'"'s blood from information received from a sensor; calculating a probability distribution of an actual value of the oxygen saturation of the patient'"'"'s blood based at least in part upon information received from the sensor; calculating, by the pulse oximeter, an adjusted threshold based at least in part upon the probability distribution and a predetermined threshold, wherein when the estimated value of oxygen saturation exceeds the adjusted threshold an alarm is indicated; determining that the estimated value of the oxygen saturation exceeds the adjusted threshold; determining, by the pulse oximeter, whether an accuracy of the estimated value has recently degraded by comparing a current accuracy of the estimated value to a previous accuracy of the estimated value; and delaying generating, by the pulse oximeter, the alarm based at least in part upon determining that the accuracy of the estimated value has recently degraded. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification