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Method and apparatus for non-invasive continuous monitoring of cerebrovascular autoregulation state

  • US 8,062,224 B2
  • Filed: 10/27/2005
  • Issued: 11/22/2011
  • Est. Priority Date: 10/28/2004
  • Status: Active Grant
First Claim
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1. A method for continuous real-time cerebrovascular autoregulation state monitoring comprising the steps of:

  • monitoring intracranial blood volume respiratory waves with an intracranial blood volume respiratory wave monitor;

    simultaneously monitoring lung volume respiratory waves with a lung volume respiratory wave monitor;

    generating an information signal from said intracranial blood volume respiratory waves;

    generating a reference signal from said lung volume respiratory waves;

    filtering said information signal into a first wave component;

    filtering said reference signal into a second wave component;

    determining a phase shift between said first signal wave component and said second wave component;

    assigning a value to said phase shift; and

    comparing the assigned phase shift value to a predetermined phase shift threshold value in a processor to determine the cerebrovascular autoregulation state.

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