State-based load shedding for physiological signals

• US 20080183050A1
• Filed: 01/30/2007
• Published: 07/31/2008
• Est. Priority Date: 01/30/2007
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Goddeau, David, Thong, Jean-Manuel Van, Bar-or, Amir, Kontothanassis, Leonidas
• Granted Patent: US 7,761,140 B2
• Time in Patent Office: Days
• US Class Current: 600/301
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: G16H 40/67 for remote operation

Abstract

A method of load-shedding in a system having a plurality of signal sources is disclosed. The method comprises the steps of: (a) for each signal source S_i selected from a set of sources {S₁, S₂, . . . }, each source having state p_i,k selected from a set of states {p_1,1, p_1,2, . . . , p_1,N; p_2,1, p_2,2, . . . , p_2,N; . . . }, wherein i is an integer greater than one, N is an integer not less than two and k is an integer from 1 to N: (i) obtaining fractions f_i,k, wherein each 0≦f_i,k<1 is a fraction of a signal from source S_i to be discarded if source S_i is in state p_i,k; and (ii) determining respective state p_i,k of signal source S_i based on the signal from source S_i; and (b) for each source signal S_i in determined state p_i,k, discarding fraction f_i,k of a signal from source S_i.

Claims

1. A method of load-shedding in a system having a plurality of signal sources, said method comprising:

a. for each signal source S_i selected from a set of sources {S₁, S₂, . . . }, each source having state p_i,k selected from a set of states {p_1,1, p_1,2, . . . , p_1,N;

p_2,1, p_2,2, . . . , p_2,N;

. . . }, wherein i is an integer greater than one, N is an integer not less than two and k is an integer from 1 to N;

i. obtaining fractions f_i,k, wherein each 0≦

f_i,k<

1 is a fraction of a signal from source S_i to be discarded if source S_i is in state p_i,k; and

ii. determining respective state p_i,k of signal source S_i based on the signal from source S_i; and

b. for each source signal S_i in determined state p_i,k, discarding fraction f_i,k of a signal from source S_i.

2. The method of claim 1, wherein

state p_i,k is selected from a set of states {p_{i, 1}, p_i,2};

fraction f_i,1 is 0; and

fraction f_i,2 is a fraction greater than zero and less than 1.

3. The method of claim 2 wherein f_i,2 is a fraction greater than zero and less than or equal to about 0.5.

4. The method of claim 2, wherein each source S_i is a physiological data collecting device.

5. The method of claim 4, wherein the signal is an electrocardiogram signal.

6. The method of claim 5, wherein state p_i,1 corresponds to normal heart activity and state p_i,2 corresponds to atrial fibrillation.

7. The method of claim 1, wherein each source S_i is assigned state p_i,k if said state p_i,k has a duration above threshold duration T_i,k.

8. The method of claim 7, wherein fractions f_i,k are computed as fractions of threshold T_i,k.

9. The method of claim 8, wherein f_i,k is less than or equal to about 50% of T_i,k.

10. The method of claim 8, wherein f_i,k is less than or equal to about 25% of T_i,k.

11. The method of claim 7, wherein T_i,k is less than or equal to about 15 minutes.

12. The method of claim 7, wherein T_i,k is less than or equal to about 10 minutes.

13. The method of claim 7, wherein T_i,k is less than or equal to about 5 minutes.

14. The method of claim 7, wherein the signal is an electrocardiogram signal.

15. The method of claim 14 wherein T_i,k is about 500 heart beats.

16. The method of claim 14 wherein T_i,k is about 400 heart beats.

17. The method of claim 14 wherein T_i,k is about 300 heart beats.

18. A method of load-shedding in a system for continuously monitoring one or more patients, said method comprising:

a. for each patient having a state selected from a “

normal”

state or a “

pathologic”

state;

i. obtaining fractions f, wherein 0≦

f<

1 and f is a fraction of a signal from each patient to be discarded if said patient is in the “

normal”

state; and

ii. determining a respective state of the patient based on a signal from said patient;

b. for each patient in the “

normal”

state discarding fraction f of the signal from said patient.

19. A computer system for shedding signal load in a network having a plurality of devices, said system comprising:

a. means for collecting signals from signal sources S_i, selected from a set of sources {S₁, S₂, . . . }, each source having state p_i,k selected from a set of states {p_1,1, p_1,2, . . . , p_1,N;

p_2,1, p_2,2, . . . , p_2,N;

. . . }, wherein i is an integer greater than one, N is an integer not less than two and k is an integer from 1 to N;

b. means for receiving as an input or computing fractions f_i,k, wherein each 0≦

f_i,k<

1 is a fraction of a signal from source S_i to be discarded if source S_i is in state p_i,k;

c. means for determining respective state p_i,k of each signal source S_i; and

d. means for discarding fraction f_i,k of a signal from source S_i for each source signal S_i in determined state p_i,k.

20. The computer system of claim 19, wherein

state p_i,k is selected from a set of states {p_i,1, p_i,2};

fraction f_i,1 is 0;

fraction f_i,2 is a fraction greater than zero and less than 1;

the signal is an electrocardiogram signal; and

state p_i,1 corresponds to normal heart activity and state p_i,2 corresponds to atrial fibrillation.

21. The computer system of claim 19, wherein each source S_i is assigned state p_i,k if said state p_i,k has a duration above threshold duration T_i,k.

22. The computer system of claim 21, wherein fractions f_i,k are computed as fractions of threshold T_i,k.

23. The computer system of claim 21, wherein T_i,k is less than or equal to about 15 minutes.

24. The computer system of claim 21, wherein the signal is an electrocardiogram signal, and T_i,k is between about 500 and 300 heart beats.

25. A computer system for signal load-shedding in a system for continuously monitoring one or more patients, said system comprising:

a. means for collecting signals from each patient having respective state selected from a “

normal”

state and “

pathologic”

state;

b. means for receiving as an input or computing fractions f, wherein each 0≦

f<

1 is a fraction of a signal from each patient to be discarded if said patient is in the “

normal”

state;

c. means for determining respective state of each patient based on a signal from each patient; and

d. means for discarding fraction f of the signal from each patient in the “

normal”

state.