Methods for detecting and monitoring sleep disordered breathing using an implantable medical device
First Claim
1. A method of identifying sleep disordered breathing (SDB) episodes in a patient, the method comprising:
- measuring a hemodynamic pressure of the patient;
periodically deriving statistical information about the measured hemodynamic pressure at storage intervals, the statistical information including a high value, a middle value, and a low value representative of the distribution of the hemodynamic pressure over each storage interval;
determining a ratio of a lower range to a full range of the hemodynamic pressure, the lower range being equal to a difference between the middle value and the low value, and the full range being equal to the difference between the high value and the low value; and
determining whether the patient has experienced an SDB episode based upon the ratio.
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Abstract
A method of identifying sleep disordered breathing (SDB) in a patient includes monitoring a hemodynamic pressure, deriving high, middle, and low values representative of the distribution of the hemodynamic pressure over a storage interval, measuring a ratio of a lower range to a full range of the hemodynamic pressure based on the derived high, middle, and low values, and using the ratio to determine whether the patient has experienced an SDB episode. Certain embodiments of the invention compare the ratio to a threshold value to identify the occurrence of an SDB episode, while other embodiments of the invention identify the occurrence of an SDB episode by monitoring for a simultaneous increase in both the ratio and the full range of the hemodynamic pressure. In certain other embodiments of the invention, activity level and/or duration criteria may be employed to confirm the occurrence of an SDB episode detected using the ratio.
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Citations
20 Claims
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1. A method of identifying sleep disordered breathing (SDB) episodes in a patient, the method comprising:
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measuring a hemodynamic pressure of the patient;
periodically deriving statistical information about the measured hemodynamic pressure at storage intervals, the statistical information including a high value, a middle value, and a low value representative of the distribution of the hemodynamic pressure over each storage interval;
determining a ratio of a lower range to a full range of the hemodynamic pressure, the lower range being equal to a difference between the middle value and the low value, and the full range being equal to the difference between the high value and the low value; and
determining whether the patient has experienced an SDB episode based upon the ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of identifying sleep disordered breathing (SDB) in a patient, the method comprising:
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measuring a hemodynamic pressure over a period of time;
monitoring an activity level signal of a patient over the period of time;
measuring a phase difference between the hemodynamic pressure and activity level signals; and
identifying the presence of SDB if the phase difference is greater than a threshold amount. - View Dependent Claims (17, 18)
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19. A method of identifying sleep disordered breathing (SDB) in a patient, the method comprising:
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measuring a hemodynamic pressure signal over a period of time;
monitoring an activity level signal of a patient over the period of time;
classifying the activity level as being low when below a predetermined activity level; and
during a period when activity level is classified as low, identifying the presence of SDB when a change in the hemodynamic pressure signal is greater than a threshold. - View Dependent Claims (20)
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Specification