Physiological alarm threshold determination
A method of reducing nuisance alarms for a physiological parameter at a specific care unit by determining an alarm threshold optimized for the care unit, the care unit including a plurality of patients being monitored for the physiological parameter. Measured physiological parameters for the plurality of patients is measured and provided to a threshold recommendation system. The threshold recommendation system determines a recommended parameter specific alarm threshold value calculated to reduce false alarms by determining how many alarms are generated at each of a range of threshold values and choosing a threshold value from the range of threshold values that reduces a number of false alarms without unacceptably increasing missed true alarms for said patient measurements.
1. A method of reducing nuisance alarms for a physiological parameter by determining an alarm threshold optimized for a specific care unit, the care unit including a plurality of patients being monitored for the physiological parameter, the method comprising:
in the care unit, electronically measuring patient specific physiological parameters for the plurality of patients using a plurality of patient monitors;
electronically providing the patient specific physiological parameters to a threshold recommendation system;
receiving at least one recommended parameter specific alarm threshold value, said value responsive to a number of alarms triggered by said patient specific physiological parameters at said at least one recommended parameter specific alarm threshold value;
said at least one recommended parameter specific alarm threshold value calculated to reduce said number of alarms at said care center for said parameter by determining how many alarms are generated for each of a range of threshold values and choosing a threshold value from the range of threshold values that reduces a number of alarms; and
programming at least one of said plurality of patient monitors with a threshold value incorporating information gained by said suggested threshold value.
2. The method of claim 1 , wherein electronically measuring patient specific physiological parameters comprises receiving physiological parameter measurements from the plurality of patient monitors operated in the care unit and stored at a central repository.
3. The method of claim 2 , wherein the physiological parameters comprises one or more of raw physiological signals, detected alarm events, or care provider indications of medical interventions.
4. The method of claim 1 , wherein the method is repeated for different care units and the receiving the at least one recommendation comprises a different recommendation for at least two different care units.
5. The method of claim 1 , wherein said at least one recommended parameter specific alarm threshold value is calculated to reduce said number of alarms at said care center for said parameter by determining how many alarms are generated for each of the range of threshold values based on differences in one or more of timing, number, type, or duration of alarm conditions and choosing the threshold value from the range of threshold values that reduces the number of alarms.
6. The method of claim 1 , wherein said at least one recommended parameter specific alarm threshold value is calculated to reduce said number of alarms at said care center for said parameter by determining how many alarms are generated for each of the range of threshold values based on differences in an alarm delay time and choosing the threshold value from the range of threshold values that reduces the number of alarms.
7. The method of claim 1 , wherein said at least one recommended parameter specific alarm threshold value is calculated to reduce said number of alarms at said care center for said parameter by determining how many alarms are generated for each of the range of threshold values at least in part by correlating temporally proximate medical interventions with alarm events to identify true alarms and distinguish false alarms and choosing the threshold value from the range of threshold values that reduces the number of alarms.
8. The method of claim 7 , further comprising providing the medical intervention information to the threshold recommendation system.
9. The method of claim 7 , wherein the medical intervention information is estimated based on care provider time spent with a patient.
10. The method of claim 9 , wherein care provider time spent with the patient is estimated by one or more of a presence of clinician token, a number of consecutive alarm silences or a length of alarm silences.
11. The method of claim 9 , wherein medical intervention information is estimated based on trend activity of the physiological parameter which is temporally proximate an alarm event.
12. The method of claim 11 , wherein the trend activity indicative of a medical intervention comprises continued low or decreasing parameter values.
13. The method of claim 11 , wherein the trend activity indicative of a medical intervention comprises continued low or decreasing parameter values.
14. The method of claim 1 , wherein the care unit is one of a hospital or care facility.
15. The method of claim 1 , wherein the recommended parameter specific alarm threshold is an inflection point on a graph of alarm limits vs number of alarms for the patient specific physiological parameters.
16. A method of determining an alarm threshold optimized for a specific patient care unit, the alarm threshold selected to reduce nuisance alarms for a physiological parameter in the care unit, the care unit including a plurality of patients being monitored for the physiological parameter, the method comprising:
accessing measurements of patient physiological parameters across the plurality of patients using a plurality of monitoring devices in the patient care unit;
using the measurements, determining a first number of alarms that would have been triggered at a first parameter alarm threshold;
using the measurements, determining a second number of alarms that would have been triggered at a second parameter alarm threshold different from the first threshold;
selecting one of the first and second alarm thresholds that if applied would reduce alarm activations; and
recommending, to the patient care unit, use of a care unit specific alarm threshold responsive to the selected one of the first and second alarm thresholds.
17. The method of claim 16 , wherein the measurements of patient physiological parameters comprises one or more of raw physiological signals, detected alarm events, or care provider indications of medical interventions.
18. The method of claim 16 , wherein the method is repeated for different care units and the analyzing the physiological parameter measurements provides a different recommendation resulting from one or more differences of a type of monitoring equipment used, patient population, a type of medical care offered, or a type of medical procedures implemented for the different care units.
19. The method of claim 16 , further comprising correlating temporally proximate medical interventions with alarm events to identify true alarms and distinguish false alarms.
20. The method of claim 19 , wherein the medical intervention information is manually recorded by a care provider.
21. The method of claim 19 , wherein the medical intervention information is estimated based on care provider time spent with a patient.
22. The method of claim 21 , wherein care provider time spent with the patient is estimated by one or more of a presence of clinician token, a number of consecutive alarm silences or a length of alarm silences.
23. The method of claim 21 , wherein medical intervention information is estimated based on trend activity of the physiological parameter which is temporally proximate an alarm event.
24. The method of claim 23 , wherein the trend activity indicative of a medical intervention comprises continued low or decreasing parameter values.
25. The method of claim 23 , wherein the trend activity indicative of a medical intervention comprises continued low or decreasing parameter values.
26. The method of claim 16 , wherein the care unit is one of a hospital or care facility.