Method and apparatus for controlling an alarm while monitoring

• US 7,489,250 B2
• Filed: 05/26/2006
• Issued: 02/10/2009
• Est. Priority Date: 05/19/2003
• Status: Active Grant

• Current Assignee: GE Medical Systems Information Technologies Incorporated (General Electric Company)
• Original Assignee: GE Medical Systems Information Technologies Incorporated (General Electric Company)
• Inventors: Bock, Elizabeth A., Hutchinson, George M., Sitzman, David A.
• Primary Examiner(s): Lee; Benjamin C
• Assistant Examiner(s): Mehmood; Jennifer
• Application Number:
  US11/442,490
• Publication Number:
  US 20060220885A1
• Time in Patent Office: 991 Days
• Field of Search: 340/573.1, 340/500, 340/501, 340/539, 340/5.8, 600/300, 600/301, 600/306, 600/323, 600/324, 600346-348, 705/2, 705/3
• US Class Current: 340/573.1
• CPC Class Codes: A61B 5/02405 Determining heart rate variability
• CPC Class Codes: A61B 5/02455 provided with high/low alarm devices
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 40/67 for remote operation

Abstract

A method for monitoring a subject can include acquiring data from the subject, and dynamically adjusting an alarm limit based on the data. The method can also comprise determining a first value that is typical for the subject for the characteristic being monitored, determining a second value for the characteristic being monitored, and generating a comparison based on the two values. The method could also comprise setting a threshold for a characteristic being monitored, and decreasing the alarm limit if the data crosses the threshold. The method could also include setting an extremity limit. The following methods can be applied to the monitoring of a healthcare patient, or other subjects of interest. Also, the values used in the monitoring of the subject can be configured to be transferable from one monitor to another.

Claims

1. A method for monitoring of a patient, comprising:

acquiring data from a patient;

dynamically adjusting an alarm criteria based on the data;

determining a first value that is typical for the patient for the characteristic being monitored;

determining a second value for the characteristic being monitored;

generating a comparison based on the first value and the second value;

measuring a slope based on first and second data with respect to time;

determining a plurality of slopes of data value with respect to time and determining the degree of correlation of the slopes, wherein the determining the degree of correlation of the slopes comprises determining a mean slope value and a standard deviation of the slope values; and

sending an alarm if the mean slope value exceeds a threshold, wherein the alarm that is sent if the mean slope exceeds a threshold is only sent if the standard deviation of the slope values also exceeds a threshold.

2. The method of claim 1, further comprising sending an alarm based on the comparison.

3. A method for sending an alarm using a medical monitor that is monitoring a patient, comprising:

acquiring first data from a patient;

acquiring second data from a patient;

generating a comparison of the first data to the second data, wherein the monitor is configured to generate an alarm based on the comparison;

measuring a slope based on first and second data with respect to time;

determining a plurality of slopes of data value with respect to time and determining the degree of correlation of the slopes, wherein the determining the degree of correlation of the slopes comprises determining a mean slope value and a standard deviation of the slope values;

and

sending an alarm if the mean slope value exceeds a threshold, wherein the alarm that is sent if the mean slope exceeds a threshold is only sent if the standard deviation of the slope values also exceeds a threshold.

4. The method of claim 3, wherein generating the comparison of the first data and the second data comprises comparing a first value calculated based on the first data and a second value calculated based on the second data.

5. The method of claim 3, wherein comparing the first value and the second value comprises calculating a rate of change between the first value and the second value.

6. The method of claim 4, wherein the first and second values are each calculated based on a plurality of data acquired from a patient.

7. The method of claim 3, wherein the first data and the second data are separated in time by at least ten minutes.

8. The method of claim 7, wherein the first data and the second data are separated in time by at least thirty minutes.

9. The method of claim 3, wherein the first data and the second data are acquired within 24hours of each other.

10. The method of claim 9, wherein the first and second data are acquired within four hours of each other.

11. The method of claim 9, wherein the first and second data are separated in time by at least ten minutes.

12. The method of claim 3, further comprising obtaining a plurality of additional data, and determining a slope of a value of the data with respect to time based on the additional data.

13. A monitoring system for monitoring a patient, the system comprising:

a data acquisition device configured to collect a set of data from the patient;

a processor configured to dynamically adjust an alarm criteria based on the set of data collected from the patient, wherein the processor is further configured to determine a first value and a second value from the collected data that is typical for the patient for a characteristic being monitored, and wherein the processor is further configured to generate a comparison based on the first value and the second value, and further wherein the processor is configured to measure a slope based on first and second data with respect to time to determine a plurality of slopes of data value with respect to time and determine the degree of correlation of the slopes, wherein determining the degree of correlation of the slopes comprises determining a mean. slope value and a standard deviation of the slope values and to send an alarm if the mean slope value exceeds a threshold, wherein the alarm that is sent if the mean slope exceeds a threshold is only sent if the standard deviation of the slope values also exceeds a threshold.

14. The system of claim 13, further comprising a monitor configured to generate an alarm based on the comparison.

15. The system of claim 13, wherein the processor generates the comparison by any one of the following techniques:

a rate of charge calculation;

a time separation and acquisition calculation; and

a slope degree correlation determination.