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
15 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- measuring a hemodynamic pressure of the patient;
Specification