Apparatus and method of non-invasive cerebrovascular autoregulation monitoring
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United States of America Patent
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Aug 16, 2011
Grant Date -
Oct 29, 2009
app pub date -
Apr 25, 2008
filing date -
Apr 25, 2008
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Abstract
A non-invasive method for monitoring of cerebrovascular blood flow autoregulation state includes sensing intracranial blood volume waves, filtering a slow wave, respiratory wave, and pulse wave informative components from said intracranial blood volume waves, filtering slow wave and respiratory wave reference components from the pulse wave envelope, calculating a first phase shift between said slow wave informative component and said slow wave reference component, calculating a second phase shift between said respiratory wave informative component and said respiratory wave reference component, and calculating the index of evaluation of the status of cerebral autoregulation state (ICAS) from said first phase shift and said second phase shift.
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