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System and method for estimating cardiac output

  • US 5,687,733 A
  • Filed: 10/26/1995
  • Issued: 11/18/1997
  • Est. Priority Date: 10/26/1995
  • Status: Expired due to Term
First Claim
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1. A method for estimating blood output through a flow region of a patient'"'"'s body, comprising the following steps:

  • A) injecting an indicator as an indicator input signal having an input signal profile and a period into an upstream position in the flow region;

    B) sensing the presence of the indicator at a downstream position in the flow region to determine an indicator output signal;

    C) estimating as a predetermined function of the input signal profile and the indicator output signal both a local blood output value over a local estimation time, and a trend blood output value over a trend estimation time, in which the trend estimation time is longer than the local estimation time, thereby providing estimated blood output values corresponding to both relatively fast and slow changes in blood output.

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