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Volume status monitor: peripheral venous pressure, hypervolemia and coherence analysis

  • US 8,727,997 B2
  • Filed: 10/16/2009
  • Issued: 05/20/2014
  • Est. Priority Date: 10/17/2008
  • Status: Active Grant
First Claim
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1. A method for compensating a cardiovascular waveform having ventilation-induced variation for pulmonary effort using a processor, the method comprising:

  • generating a cardiovascular waveform representing physiological characteristics of a subject;

    generating a respiratory signal for the subject; and

    using a processor to calculate the total power spectral intensity due to respiration, wherein the calculating the total power spectral intensity due to respiration includes;

    compensating the cardiovascular waveform for pulmonary effort by multiplying the power spectrum of the cardiovascular waveform by the power spectrum of the respiratory signal; and

    detecting a change in amplitude of ventilation-induced variation (VIV) in the compensated cardiovascular waveform by integrating the resulting compensated waveform over a range of respiratory frequencies, wherein the change in amplitude is reflective of a physiological change in the subject.

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