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Monitoring a condition of a patient under anaesthesia or sedation

  • US 6,685,649 B2
  • Filed: 04/09/2002
  • Issued: 02/03/2004
  • Est. Priority Date: 07/04/2001
  • Status: Expired due to Term
First Claim
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1. A method for monitoring a condition of a patient under anaesthesia or sedation, the method comprising the steps of:

  • acquiring a signal representing temporally a cardiovascular activity of the patient;

    detecting periodically repeated waveforms in said signal;

    calculating at least one parameter selected from;

    time intervals between said successive waveforms, pressures from said successive waveforms, temporal rates from said successive waveforms;

    forming respectively at least one of the following;

    a mathematical time series of said time intervals, or a mathematical pressure series of said pressures, or a mathematical rate series of said temporal rates;

    filtering said time series and/or said pressure series and/or said rate series mathematically to provide a plurality of successive average values each over a predetermined first time period; and

    detecting a substantial decrease, or increase respectively in said plurality of successive average values.

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