Systems and methods for optimizing autoregulation measurements

• US 10,194,870 B2
• Filed: 05/04/2016
• Issued: 02/05/2019
• Est. Priority Date: 05/27/2015
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Montgomery, Dean, Addison, Paul S.
• Primary Examiner(s): Bertram, Eric D.
• Application Number:
  US15/146,548
• Publication Number:
  US 20160345913A1
• Time in Patent Office: 1,007 Days
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/14553 specially adapted for cerebral tissue
• CPC Class Codes: A61B 5/7275 Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass

Abstract

A method for monitoring autoregulation includes receiving a blood pressure signal and a regional oxygen saturation signal from a patient. The method also includes determining one or more pairs of linear correlation lines between the blood pressure signal and the regional oxygen saturation signal based on one or more bins. Each of the one or more bins includes one or more regional oxygen saturation values derived from the regional oxygen saturation signal. The method also includes determining a value indicative of the patient'"'"'s autoregulation status based on a first pair of linear correlation lines selected from the one or more pairs of linear correlation lines and providing a signal indicative of the patient'"'"'s autoregulation status to an output device.

Claims

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

receiving, by a processor and from one or more sensors, a blood pressure signal indicative of a blood pressure of a patient and a regional oxygen saturation signal indicative of blood oxygen saturation of the patient;

determining, by the processor, one or more pairs of linear correlation lines between the blood pressure signal and the regional oxygen saturation signal based on one or more bins, wherein each of the one or more bins comprises one or more regional oxygen saturation values derived from the regional oxygen saturation signal;

determining, by the processor, a value indicative of the patient'"'"'s autoregulation status based on a first pair of linear correlation lines selected from the one or more pairs of linear correlation lines; and

at least one of;

presenting, via a display, information indicative of the patient'"'"'s autoregulation status;

or

outputting, via an audio device, information indicative of the patient'"'"'s autoregulation status,

wherein the information indicative of the patient'"'"'s autoregulation status is based on the value indicative of the patient'"'"'s autoregulation status.

2. The method of claim 1, comprising generating the one or more bins by grouping one or more regional oxygen saturation values based on one or more blood pressure values derived from the blood pressure signal.

3. The method of claim 1, comprising generating a mean value or a median value of the one or more bins.

4. The method of claim 3, comprising determining the one or more pairs of linear correlation lines based the mean value or the median value.

5. The method of claim 4, wherein each pair of the one or more pairs of linear correlation lines comprises a left side regression line and a right side regression line.

6. The method of claim 5, comprising minimizing a first slope of the right side regression line when compared to a second slope of the left side regression line to select the first pair of linear correlation lines and determine the value indicative of the patient'"'"'s autoregulation status.

7. The method of claim 5, comprising minimizing a first p-value or a first correlation coefficient of the right side regression line when compared to a second p-value or a second correlation coefficient of the left side regression line to select the first pair of linear correlation lines and determine the value indicative of the patient'"'"'s autoregulation status.

8. The method of claim 1, wherein determining the value indicative of the patient'"'"'s autoregulation status comprises determining an upper autoregulation limit or a lower autoregulation limit of the first pair of linear correlation lines.

9. The method of claim 1, comprising excluding one or more regional oxygen saturation values from the one or more bins prior to determining the one or more pairs of linear correlation lines.

10. The method of claim 1, wherein determining the one or more pairs of linear correlation lines comprises excluding one or more bins prior to selecting the first pair of linear correlation lines and determining a value indicative of the patient'"'"'s autoregulation status.

11. A monitor for monitoring autoregulation of a patient, the monitor comprising:

a memory storing instructions for;

receiving a blood pressure signal indicative of a blood pressure of a patient and a regional oxygen saturation signal indicative of blood oxygen saturation of the patient;

determining one or more pairs of linear correlation lines between the blood pressure signal and the regional oxygen saturation signal based on one or more bins, wherein each of the one or more bins comprises one or more regional oxygen saturation values derived from the regional oxygen saturation signal;

determining a value indicative of the patient'"'"'s autoregulation status based on a first pair of linear correlation lines selected from the one or more pairs of linear correlation lines; and

at least one of;

presenting, via a display, information indicative of the patient'"'"'s autoregulation status;

or

outputting, via an audio device, information indicative of the patient'"'"'s autoregulation status,

wherein the information indicative of the patient'"'"'s autoregulation status is based on the value indicative of the patient'"'"'s autoregulation status; and

a processor configured to execute the instructions.

12. The monitor of claim 11, wherein the memory stores instructions for generating the one or more bins by grouping one or more regional oxygen saturation values based on one or more blood pressure values derived from the blood pressure signal.

13. The monitor of claim 11, wherein the memory stores instructions for generating a mean value or a median value of the one or more bins, and determining the one or more pairs of linear correlation lines based the mean value or the median value.

14. A system, comprising:

a regional oxygen saturation sensor configured to generate an oxygen saturation signal indicative of blood oxygen saturation of a patient; and

a monitor, comprising;

a display; and

a processor configured to;

receive a blood pressure signal indicative of a blood pressure of the patient and the oxygen saturation signal;

determine one or more pairs of linear correlation lines between the blood pressure signal and the oxygen saturation signal based on one or more bins, wherein each of the one or more bins comprises one or more regional oxygen saturation values derived from the oxygen saturation signal;

determine a value indicative of the patient'"'"'s autoregulation status based on a first pair of linear correlation lines selected from the one or more pairs of linear correlation lines; and

at least one of;

present, via the display, information indicative of the patient'"'"'s autoregulation status;

or

output, via an audio device, information indicative of the patient'"'"'s autoregulation status,

wherein the information indicative of the patient'"'"'s autoregulation status is based on the value indicative of the patient'"'"'s autoregulation status.

15. The system of claim 14, wherein the regional oxygen saturation sensor is further configured to generate the blood pressure signal.

16. The system of claim 14, wherein the processor is configured to present the information indicative of the patient'"'"'s autoregulation status by at least presenting the value indicative of the patient'"'"'s autoregulation status on the display.

17. The system of claim 14, wherein the processor is configured to cause display of a visual indication of a lower autoregulation limit or an upper autoregulation limit, a slope of the linear correlation, a correlation coefficient, or any combination thereof on the display.

18. The system of claim 14, wherein the processor is configured to generate the one or more bins by at least grouping one or more regional oxygen saturation values based on one or more blood pressure values derived from the blood pressure signal.

19. The system of claim 14, wherein the processor is configured to generate a mean value or a median value of the one or more bins, and determine the one or more pairs of linear correlation lines based the mean value or the median value.

20. The system of claim 19, wherein the processor is configured to select the first pair of linear correlation lines from the one or more pairs of linear correlation lines based on one or more slopes of the one or more pairs of linear correlation lines.

21. The system of claim 14, wherein the processor is configured to exclude one or more regional oxygen saturation values from the one or more bins or exclude one or more bins when determining the one or more pairs of linear correlation lines.