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Sleep monitoring using a photoplethysmograph

  • US 7,674,230 B2
  • Filed: 05/17/2007
  • Issued: 03/09/2010
  • Est. Priority Date: 11/22/2004
  • Status: Active Grant
First Claim
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1. A method for diagnosis, comprising:

  • receiving from a sensor coupled to a body of a sleeping patient a photoplethysmograph signal; and

    operating a data processor for processing the photoplethysmograph signal independently of any other physiological measurements in order to identify apnea episodes which comprise Cheyne-Stokes breathing events and to distinguish a light sleep stage from a deep sleep stage of the patient based on the identified apnea episodes;

    wherein processing the photoplethysmograph signal comprises distinguishing a rapid eye movement (REM) sleep stage from a light sleep stage responsively to a characteristic of the Cheyne-Stokes breathing events, selected from the group of characteristics consisting of a Cheyne-Stokes wavelength and a desaturation depth.

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