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Method and system for detection of respiratory variation in plethysmographic oximetry

  • US 8,465,434 B2
  • Filed: 02/24/2012
  • Issued: 06/18/2013
  • Est. Priority Date: 12/06/2007
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a database to store data representing a physiological condition of a patient over a period of time, wherein the data comprises data corresponding to respiratory activity and data corresponding to cardiac oscillations, wherein the data corresponding to respiratory activity comprises a first waveform and the data corresponding to the cardiac oscillations comprises a second waveform; and

    a module for detecting a pattern of the second waveform consistent with a cycle of the first waveform and detecting an abnormality indicative of pulsus paradoxus in the pattern, andwherein detecting the abnormality comprises determining a value from the pattern based on an average offset of wave bases of the second waveform from a baseline and an average amplitude of wave peaks of the second waveform from a best-fit line to the wave bases.

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