Claims
- 1. A method for detecting a respiratory disturbance, comprising:
sensing a physiological signal containing a frequency or an amplitude component related to at least two respiratory cycles; deriving at least one respiratory parameter from the physiologic signal; and detecting a respiratory disturbance event when the at least one respiratory parameter meets or exceeds a predetermined criteria threshold for detecting the respiratory disturbance.
- 2. A method according to claim 1, further including measuring the magnitude of a characteristic of the respiratory disturbance.
- 3. A method of claim 2, wherein a measure of the respiratory disturbance is at least a one of:
an apnea duration; a hypopnea duration; a hyperpnea duration; a periodic breathing cycle length.
- 4. A method according to claim 1, wherein the physiological signal is at least a one of:
a thoracic impedance; an ECG signal; an EGM signal; a blood pressure signal; an activity level measurement; an oxygen saturation measurement.
- 5. A method according to claim 1, wherein the respiratory disturbance comprises Kussmaul breathing.
- 6. A method according to claim 1, wherein the respiratory disturbance is Cheyne-Stokes respiration.
- 7. A method according to claim 1, wherein the respiratory disturbance is sleep apnea.
- 8. A method according to claim 1, further including a step of determining a circulatory delay time comprising:
measuring an oxygen saturation; and determining the time between the end of the respiratory disturbance and a subsequent minimum or a subsequent maximum oxygen saturation.
- 9. A method according to claim 8, further including a step of determining an estimate of cardiac output based on the circulatory delay time.
- 10. A method according to claim 3, further including a step of determining an estimate of cardiac function based on a metric of the respiratory disturbance.
- 11. A method according to claim 1, further including a step of triggering the storage of physiological data upon the detection of the respiratory disturbance.
- 12. A method according to claim 1, further including a step of triggering a therapy based at least in part upon detection of the respiratory disturbance.
- 13. A method according to claim 1, further including a step of generating a warning to alert a clinician or a patient upon detection of the respiratory disturbance.
- 14. A method according to claim 9, further comprising determining a heart failure status of a patient in the event that the estimate of cardiac function is lower than a predetermined lower threshold.
- 15. A method according to claim 14, further comprising the step of storing a plurality of data related to the estimated cardiac output over a period of time.
- 16. A device for detecting a respiratory disturbance, comprising:
means for sensing a physiological signal containing a frequency component or an amplitude component related to a common characteristic of at least two respiratory cycles; means for deriving at least one respiratory parameter from the physiologic signal; and means for detecting a respiratory disturbance event when the at least one respiratory parameter meets or exceeds a predetermined criteria threshold for detecting the respiratory disturbance.
- 17. A computer readable medium for storing a set of computer instructions for performing the following method:
instructions for sensing a physiological signal containing a frequency component or an amplitude component related to a common characteristic of at least two respiratory cycles; instructions for deriving at least one respiratory parameter from the physiologic signal; and instructions for detecting a respiratory disturbance event when the at least one respiratory parameter meets or exceeds a predetermined criteria threshold for detecting the respiratory disturbance.
- 18. A method according to claim 17, further including: instructions for measuring the magnitude of a characteristic of the respiratory disturbance.
- 19. A method of claim 18, wherein a measure of the respiratory disturbance is at least a one of:
an apnea duration; a hypopnea duration; a hyperpnea duration; a periodic breathing cycle length.
- 20. A method according to claim 17, wherein the physiological signal is at least a one of:
a thoracic impedance; an ECG signal; an EGM signal; a blood pressure signal; an activity level measurement; an oxygen saturation measurement.
- 21. A method according to claim 17, wherein the respiratory disturbance comprises Kussmaul breathing.
- 22. A method according to claim 17, wherein the respiratory disturbance comprises a Cheyne-Stokes respiration event.
- 23. A method according to claim 17, wherein the respiratory disturbance comprises a sleep apnea event.
- 24. A method according to claim 17, further including a step of determining a circulatory delay time, comprising:
instructions for measuring an oxygen saturation; and instructions for determining the time between the end of the respiratory disturbance and a subsequent minimum or a subsequent maximum oxygen saturation.
- 25. A method according to claim 24, further comprising: instructions for determining an estimate of cardiac output based on the circulatory delay time.
- 26. A method according to claim 19, further including a step of instructions determining an estimate of cardiac function based on a metric of the respiratory disturbance.
- 27. A method according to claim 17, further comprising instructions for triggering the storage of a physiological data item upon the detection of the respiratory disturbance.
- 28. A method according to claim 17, further comprising instructions for triggering a therapy based at least in part upon detection of the respiratory disturbance.
- 29. A method according to claim 17, further comprising instructions for generating a warning to alert a clinician or a patient of the detection of the respiratory disturbance.
- 30. A method according to claim 25, further comprising instructions for determining a heart failure status of a patient in the event that the estimate of cardiac function is lower than a predetermined lower threshold.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This patent disclosure claims the benefit of the filing of provisional U.S. patent application serial No. 60/439,303 filed 10 Jan. 2003.
Provisional Applications (1)
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Number |
Date |
Country |
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60439303 |
Jan 2003 |
US |