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Method for vascular impedance measurement

  • US 5,876,347 A
  • Filed: 09/23/1997
  • Issued: 03/02/1999
  • Est. Priority Date: 12/28/1990
  • Status: Expired due to Term
First Claim
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1. A method for measuring vascular impedance properties from the blood pressure waveform of a patient, the waveform containing heart beat signals, comprising the steps of:

  • measuring and digitizing an arterial blood pressure of a patient to produce a series of digitized data samples representing a waveform of the arterial blood pressure of the patient, the waveform containing a heart beat signal;

    determining an ejection time of the heart of the patient from the heart beat signal contained in the data samples;

    processing the data samples to determine a mean arterial pressure of the patient;

    processing said ejection time and other patient data to determine a cardiac output measurement value for the patient from at least said ejection time and other patient data; and

    processing the data samples and the cardiac output value and mean arterial pressure to determine for the patient one or more parameters of a vascular impedance model, the parameters being measures of vascular impedance properties.

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