Methods of generating a virtual lead associated with a physiological recording

• US 20060235322A1
• Filed: 09/07/2005
• Published: 10/19/2006
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Simske, Steven J., Zhang, Tong, Blakley, Daniel Robert
• Granted Patent: US 7,962,201 B2
• Time in Patent Office: Days
• US Class Current: 600/512
• CPC Class Codes: A61B 5/341 Vectorcardiography [VCG]

Abstract

A method of creating a virtual lead associated with a physiological recording is provided. The method can include obtaining a first physiological signal from a first lead having a first angle and a second physiological signal from a second lead having a second angle, the first lead and the second lead being associated with a subject. The method can also include transforming the first and second physiological signals into a vector representation of the first and second physiological signals and transforming the vector representation to a virtual physiological signal representing a virtual lead having a virtual lead angle.

Claims

1. A method of creating a virtual lead associated with an electrocardiogram signal, comprising the steps of:

obtaining a first electrocardiogram signal from a first lead having a first angle and a second electrocardiogram signal from a second lead having a second angle, the first lead and the second lead being associated with a subject;

transforming the first and second electrocardiogram signals into a vectorcardiogram; and

transforming the vectorcardiogram into a virtual electrocardiogram signal representing a virtual lead having a virtual lead angle.

2. The method of claim 1, wherein the step of transforming the vectorcardiogram occurs during an overlapping period of time with respect to the step of obtaining the first and the second electrocardiogram signals.

3. The method of claim 1, wherein the virtual lead angle is the same as either the first angle or the second angle.

4. The method of claim 1, wherein the virtual lead angle is different from both the first angle and the second angle.

5. The method of claim 1, wherein the step of transforming the vectorcardiogram to the virtual electrocardiogram signal representing the virtual lead further includes a step of altering a virtual peak magnitude of the virtual electrocardiogram signal to approximate or equal a peak magnitude of either the first electrocardiogram signal or the second electrocardiogram signal.

6. The method of claim 1, wherein either of the first or second electrocardiogram signals has been lost, degraded, or altered prior to the step of transforming the vectorcardiogram into the virtual electrocardiogram signal.

7. The method of claim 1, wherein the vectorcardiogram is filtered to reduce a signal artifact prior to the step of transforming the vectorcardiogram into the virtual electrocardiogram signal.

8. The method of claim 7, wherein the signal artifact is a member selected from the group consisting of electrical noise, thermal noise, movement artifacts, breathing artifacts, and combinations thereof.

9. A method of diagnosing and/or monitoring a cardiac condition, comprising:

obtaining a first electrocardiogram signal from a first lead having a first angle and a second electrocardiogram signal from a second lead having a second angle, the first lead and the second lead being associated with a subject;

determining a monitoring angle;

transforming the first and second electrocardiogram signals into a vectorcardiogram; and

transforming the vectorcardiogram into a virtual electrocardiogram signal representing a virtual lead having the monitoring angle.

10. The method of claim 9, wherein the monitoring angle corresponds to an injury current angle.

11. The method of claim 9, wherein the monitoring angle is different from both the first angle and the second angle.

12. The method of claim 9, wherein the monitoring angle is the same as either the first angle or the second angle.

13. A method of creating a virtual lead associated with a physiological recording, comprising:

obtaining a first physiological signal from a first lead having a first angle and a second physiological signal from a second lead having a second angle, the first lead and the second lead being associated with a subject;

transforming the first and second physiological signals into a vector representation of the first and second physiological signals; and

transforming the vector representation to a virtual physiological signal representing a virtual lead having a virtual lead angle.

14. The method of claim 13, wherein the step of transforming the vector representation occurs during an overlapping period of time with respect to the step of obtaining the first and the second physiological signals.

15. The method of claim 13, wherein the virtual lead angle is the same as either the first angle or the second angle.

16. The method of claim 13, wherein the virtual lead angle is different from both the first angle and the second angle.

17. The method of claim 13, wherein the step of transforming the vector representation to the virtual physiological signal representing the virtual lead further includes a step of altering a virtual peak magnitude of the virtual physiological signal to approximate a peak magnitude of either the first physiological signal or the second physiological signal.

18. The method of claim 17, wherein the peak magnitude is obtained from either the first or second physiological signals.

19. The method of claim 13, wherein either of the first or second physiological signals have been lost, degraded, or altered prior to the step of transforming the vector representation.

20. The method of claim 13, wherein the vector representation is filtered to reduce a signal artifact prior to the step of transforming the vector representation to a virtual physiological signal.

21. The method of claim 20, wherein the signal artifact is a member selected from the group consisting of electrical noise, thermal noise, movement artifacts, breathing artifacts, and combinations thereof.

22. The method of claim 13, wherein the first and second physiological signals are electrocardiogram signals.

23. The method of claim 13, wherein the first and second physiological signals are electromyogram signals.

24. The method of claim 13, wherein the first and second physiological signals are electroencephalogram signals.

25. The method of claim 13, wherein the first and second physiological signals are blood pressure signals.