SYSTEM AND METHOD FOR MONITORING AUTOREGULATION

• US 20160106372A1
• Filed: 10/13/2015
• Published: 04/21/2016
• Est. Priority Date: 10/16/2014
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Addison, Paul S., Watson, James N.
• Granted Patent: US 10,383,579 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/14553 specially adapted for cerebral tissue
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/7246 using correlation, e.g. template matching or determination of similarity

Abstract

A method for monitoring autoregulation includes, using a processor, receiving a blood pressure signal and an oxygen saturation signal from a patient. The method also includes determining a linear correlation between the blood pressure signal and the oxygen saturation signal and determining a significance value associated with the linear correlation. The method further includes providing a signal indicative of the patient'"'"'s autoregulation status to an output device based on the linear correlation and the significance value.

Claims

1. A method for monitoring autoregulation comprising:

using a processor;

receiving a blood pressure signal and an oxygen saturation signal from a patient;

determining a linear correlation between the blood pressure signal and the oxygen saturation signal;

determining a significance value associated with the linear correlation; and

providing a signal indicative of the patient'"'"'s autoregulation status to an output device based on the linear correlation and the significance value.

2. The method of claim 1, comprising providing a cerebral oximetry index value to the output device only while the significance value is below a predetermined threshold.

3. The method of claim 1, comprising providing a prior reliable cerebral oximetry index value to the output device while the significance value is above a predetermined threshold.

4. The method of claim 1, comprising averaging a current cerebral oximetry index value with a prior reliable cerebral oximetry index value to generate an average cerebral oximetry index value while the significance value is above a predetermined threshold.

5. The method of claim 4, providing the average cerebral oximetry index value to the output device.

6. The method of claim 1, comprising receiving the oxygen saturation signal from a regional saturation sensor having at least one emitter and a plurality of detectors.

7. The method of claim 1, comprising receiving a signal quality metric related to the blood pressure signal, the oxygen saturation signal, or both.

8. The method of claim 8, comprising determining the linear correlation between the blood pressure signal and the oxygen saturation signal only while the signal quality metric is above a signal quality metric threshold.

9. A monitor for monitoring autoregulation comprising:

a memory storing instructions for;

receiving a blood pressure signal and an oxygen saturation signal from a patient;

determining a linear correlation between the blood pressure signal and the oxygen saturation signal;

determining a significance value associated with the linear correlation;

providing a signal indicative of the patient'"'"'s autoregulation status to an output device based on the linear correlation and the significance value; and

a processor configured to execute the instructions.

10. The monitor of claim 9, wherein the memory stores instructions for providing a cerebral oximetry index value to the output device only while the significance value is below a predetermined threshold.

11. The monitor of claim 9, wherein the memory stores instructions for providing a prior reliable cerebral oximetry index value to the output device while the significance value is above a predetermined threshold.

12. The monitor of claim 9, wherein the memory stores instructions for averaging a current cerebral oximetry index value with a prior reliable cerebral oximetry index value to generate an average cerebral oximetry index value, and providing the average cerebral oximetry index value to the output device, while the significance value is above a predetermined threshold.

13. The monitor of claim 9, wherein the memory stores instructions for receiving the oxygen saturation signal from a regional saturation sensor having at least one emitter and a plurality of detectors.

14. The monitor of claim 9, wherein the memory stores instructions for receiving a signal quality metric related to the blood pressure signal, the oxygen saturation signal, or both.

15. The monitor of claim 9, wherein the memory stores instructions for determining the linear correlation between the blood pressure signal and the oxygen saturation signal only while the signal quality metric is above a signal quality metric threshold.

16. A system for monitoring autoregulation:

an oxygen saturation sensor configured to obtain an oxygen saturation signal from a patient;

a controller comprising a processor configured to;

receive the oxygen saturation signal and a blood pressure signal from the patient;

determine a linear correlation between the blood pressure signal and the oxygen saturation signal;

determine a significance value associated with the linear correlation; and

provide a signal indicative of the patient'"'"'s autoregulation status to an output device based on the linear correlation and the significance value.

17. The system of claim 16, wherein the oxygen saturation sensor is configured to obtain the oxygen saturation signal and the blood pressure signal from the patient.

18. The system of claim 16, comprising the output device, wherein the processor is configured to cause the output device to display a cerebral index value indicative of the patient'"'"'s autoregulation status, an indication of a cerebral index value reliability, an indication of the patient'"'"'s autoregulation status, or any combination thereof.

19. The system of claim 16, wherein the processor is configured to provide an alarm signal to the output device, and the output device is configured to provide a visual or audible alarm based on the alarm signal.

20. The system of claim 16, wherein the processor is configured to block transmission of the signal indicative of the patient'"'"'s autoregulation status to the output device while the significance value is above a predetermined threshold.