Surgery – Diagnostic testing – Cardiovascular
Reexamination Certificate
2011-08-02
2011-08-02
Mallari, Patricia C (Department: 3735)
Surgery
Diagnostic testing
Cardiovascular
C600S483000
Reexamination Certificate
active
07988635
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.
REFERENCES:
patent: 2002/0169367 (2002-11-01), Bardy
patent: 2005/0042589 (2005-02-01), Hatlestad et al.
Shabetai et al. “Pulsus Paradoxus”, Journal of Clinical Investigation. vol. 44, No. 11, 1965.
Bennett Tommy D.
Cho Yong K.
Kjellstrom Barbro M.
Duthler Reed A.
Jang Christian
Mallari Patricia C
Medtronic Inc.
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