Oscillometric determination of blood pressure

• US 20050187483A1
• Filed: 03/16/2005
• Published: 08/25/2005
• Est. Priority Date: 02/25/2003
• 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: Hersh, Lawrence T., Medero, Richard, Kolluri, Sai
• Granted Patent: US 7,311,669 B2
• Time in Patent Office: Days
• US Class Current: 600/494
• CPC Class Codes: A61B 5/02225 using the oscillometric method

Abstract

A method and system for eliminating artifacts in an oscillation envelope are disclosed. The method and system comprise evaluating conformance of the oscillometric envelope blood pressure data with a predetermined expected pattern and excluding one or more data points of the oscillometric envelope blood pressure data based on non-conformance with the expected pattern. The expected pattern is based upon generally known physiological principles relating to oscillometric envelopes, a curve fit representing an oscillometric envelope from a previous determination, or other types of criteria.

Claims

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13. A method of rejecting artifacts in oscillometric envelope blood pressure data comprising:

evaluating conformance of the oscillometric envelope blood pressure data with previous blood pressure data that meets acquisition time requirements; and

excluding one or more data points of the oscillometric envelope blood pressure data based on non-conformance with the previous blood pressure data.

14. The method of claim 13, wherein evaluating conformance of the oscillometric envelope blood pressure data comprises:

identifying at least one local extreme in the oscillometric envelope blood pressure data; and

comparing the at least one local extreme to the previous blood pressure data, including a previous MAP.

15. The method of claim 14, wherein excluding one or more data points of the oscillometric envelope blood pressure data comprises removing a local extreme that has a greatest difference in value with the previous MAP.

16. A method of rejecting artifacts in oscillometric envelope blood pressure data comprising:

storing data for a plurality of blood pressure data points, including an acquisition time;

removing blood pressure data points having an earliest acquisition time from the oscillometric envelope blood pressure data; and

reacquiring the data.

17. The method of claim 16, further comprising:

evaluating conformance of the oscillometric envelope blood pressure data with a predetermined expected pattern; and

excluding one or more data points of the oscillometric envelope blood pressure data based on non-conformance with the expected pattern.

18. The method of claim 16, further comprising:

evaluating conformance of the oscillometric envelope blood pressure data with previous blood pressure data that meets acquisition time requirements; and

excluding one or more data points of the oscillometric envelope blood pressure data based on non-conformance with the previous blood pressure data.

19. A method of rejecting artifacts in oscillometric envelope blood pressure data comprising:

applying a curvefit to the oscillometric envelope blood pressure data;

measuring a quality of deviation of the oscillometric envelope blood pressure data from the curvefit;

comparing the quality of deviation of the oscillometric envelope blood pressure data to an allowed threshold; and

removing a data point where the quality of deviation for that data point exceeds the allowed threshold.

20. The method of claim 19, wherein measuring the quality of deviation comprises determining an absolute error between the curvefit and actual data points according to an equation having substantially the form:

error=|curvefit−

raw data|

where error is absolute error;

curvefit is an amplitude derived from a curvefit of envelope data at a same pressure that corresponds to the raw data; and

raw data are measured envelope data points.

21. The method of claim 20, wherein measuring the quality of deviation further comprises using an equation having substantially the form:

$\mathrm{Qdev}=\left(1-\left(\frac{\mathrm{error}}{\mathrm{rawcomplexamplitude}}\right)\right)<br><br>\mathrm{X100}$

where Qdev is quality of deviation;

error is error previously determined; and

raw complex amplitude are data point(s) used.

22. The method of claim 19, further comprising:

evaluating conformance of the oscillometric envelope blood pressure data with a predetermined expected pattern; and

excluding one or more data points of the oscillometric envelope blood pressure data based on non-conformance with the expected pattern.

23. The method of claim 19, further comprising:

evaluating conformance of the oscillometric envelope blood pressure data with previous blood pressure data that meets acquisition time requirements; and

excluding one or more data points of the oscillometric envelope blood pressure data based on non-conformance with the previous blood pressure data.

24. The method of claim 19, further comprising:

identifying at least one local extreme in the oscillometric envelope blood pressure data; and

comparing the at least one local extreme to the previous blood pressure data, including a previous MAP.

25. The method of claim 19, further comprising:

storing data for a plurality of blood pressure data points, including an acquisition time; and

removing blood pressure data points having an earliest acquisition time.

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30. A computer program product comprising:

computer useable medium having computer logic for enabling at least one processor in a computer system to reject artifacts in oscillometric envelope blood pressure data;

means for evaluating conformance of the oscillometric envelope blood pressure data with a predetermined expected pattern; and

means for excluding one or more data points of the oscillometric envelope blood pressure data based on non-conformance with the expected pattern.