Determining blood gas saturation based on measured parameter of respiration

• US 7,479,114 B2
• Filed: 12/01/2005
• Issued: 01/20/2009
• Est. Priority Date: 12/01/2005
• Status: Active Grant

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Hartley, Jesse W., Lee, Kent, Ni, Quan, Stahmann, Jeffrey
• Primary Examiner(s): Marmor, II; Charles A
• Assistant Examiner(s): JANG, CHRISTIAN YONGKYUN
• Application Number:
  US11/291,480
• Publication Number:
  US 20070129645A1
• Time in Patent Office: 1,146 Days
• Field of Search: 600/529, 600/532
• US Class Current: 600/529
• CPC Class Codes: A61B 5/0809 by impedance pneumography
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes
• CPC Class Codes: A61B 5/4818 Sleep apnoea

Abstract

Systems and methods provide for determining blood gas saturation based on one or more measured respiration parameters. A parameter of respiration is measured implantably over a duration of time. The measured respiratory parameter is associated with a blood gas saturation level. Blood gas saturation is determined based on the measured respiration parameter. At least one of associating the measured respiratory parameter and determining blood gas saturation is preferably preformed implantably.

Claims

1. A method for measuring parameters indicative of blood gas saturation, comprising:

implantably measuring a parameter of respiration over a duration of time;

associating the measured respiratory parameter with a blood gas saturation level; and

determining blood gas saturation based on the measured respiration parameter.

2. The method of claim 1, wherein the blood gas saturation comprises blood oxygen saturation.

3. The method of claim 1, wherein the blood gas saturation comprises blood carbon dioxide saturation.

4. The method of claim 1, wherein at least one of associating the measured respiratory parameter and determining blood gas saturation is performed implantably.

5. The method of claim 1, wherein the parameter of respiration comprises one or both of a magnitude and a frequency of change in transthoracic impedance.

6. The method of claim 1, wherein the parameter of respiration comprises at least one of a respiration pattern, a respiration interval, tidal volume, and minute ventilation.

7. The method of claim 1, wherein the parameter of respiration comprises at least one of a duration of an apnea episode, a duration of a hypopnea episode, and a duration of a Cheyne-Stokes respiration episode.

8. The method of claim 1, wherein the parameter of respiration comprises at least one of a hyperventilation duration after an apnea episode, hypopnea episode, or a Cheyne-Stokes respiration episode.

9. The method of claim 1, wherein the parameter of respiration comprises a frequency of respiration during a disordered breathing event.

10. The method of claim 1, wherein the parameter of respiration comprises a frequency of respiration before or after a disordered breathing event.

11. The method of claim 1, wherein implantably measuring the parameter of respiration comprises implantably measuring a baseline parameter of respiration during patient wakefulness.

12. The method of claim 1, wherein determining blood gas saturation comprises determining blood gas saturation during sleep.

13. The method of claim 1, further comprising:

detecting sleep disordered breathing; and

indicating a severity level of the sleep disordered breathing in response to detecting sleep disordered breathing with a presence or absence of a change in blood gas saturation.

14. The method of claim 1, further comprising:

measuring one or more of a cardiac parameter, blood pressure parameter and blood flow parameter; and

wherein determining the blood gas saturation is further based at least in part on one or more of the cardiac parameter, blood pressure parameter and blood flow parameter.

15. The method of claim 1, wherein determining blood gas saturation further comprises indicating a decrease in blood oxygen saturation in response to measuring a decrease in at least one of a respiratory tidal volume, a minute ventilation, and a respiration rate.

16. The method of claim 1, wherein determining blood gas saturation further comprises indicating an increase in blood carbon dioxide saturation in response to measuring a decrease in at least one of a respiratory tidal volume, a minute ventilation, and a respiration rate.

17. The method of claim 1, wherein determining blood gas saturation comprises indicating a decrease in blood oxygen saturation in response to measuring an increase in sleep disordered breathing episodes.

18. The method of claim 1, wherein determining blood gas saturation comprises indicating an increase in blood carbon dioxide saturation in response to measuring an increase in sleep disordered breathing episodes.

25. The system of claim 14, further comprising:

a sensor configured to measure one or both of patient activity and patient posture, and

wherein the processor is configured to determine or confirm blood gas saturation based at least in part on the measured one or both of patient activity and patient posture.

26. The system of claim 14, further comprising a communication link configured to communicate the determined blood gas saturation values to a patient-external location.

19. A system for measuring parameters indicative of blood gas saturation, comprising:

an implantable device configured to measure a parameter of respiration over a duration of time; and

a processor configured to associate the measured respiratory parameter with a blood gas saturation level, and to determine blood gas saturation based on the measured respiration parameter.

20. The system of claim 19, wherein the processor is configured to detect one or both of a magnitude and frequency of change in transthoracic impedance.

21. The system of claim 19, wherein the processor is disposed in an implantable housing.

22. The system of claim 19, further comprising:

a sensor configured to measure a cardiac parameter, wherein the processor is configured to associate the cardiac parameter with a blood gas saturation level, and to determine blood gas saturation based at least in part on the measured cardiac parameter.

23. The system of claim 19, further comprising:

a sensor configured to measure a blood pressure parameter, and

wherein the processor is configured to associate the blood pressure parameter with a blood gas saturation level, and to determine blood gas saturation based at least in part on the measured blood pressure parameter.

24. The system of claim 19, further comprising:

a sensor configured to measure a blood flow parameter, and

wherein the processor is configured to associate the blood flow parameter with a blood gas saturation level, and to determine blood gas saturation based at least in part on the measured blood flow parameter.

27. A system for measuring parameters indicative of blood gas saturation, comprising:

means for implantably measuring a parameter of respiration over a duration of time;

means for associating the measured respiratory parameter with a blood gas saturation level; and

means for determining blood gas saturation based on the measured respiration parameter.