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Non-invasive determination of aortic flow velocity waveforms

  • US 6,010,457 A
  • Filed: 09/12/1997
  • Issued: 01/04/2000
  • Est. Priority Date: 03/15/1996
  • Status: Expired due to Term
First Claim
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1. A method for determining an aortic flow velocity waveform, including the steps of:

  • a. measuring non-invasively at a peripheral site a blood pressure pulse waveform;

    b. calibrating said blood pressure pulse waveform by reference to systolic and diastolic pressures measured at a site comparable to said peripheral site; and

    c. calculating the calibrated aortic pressure pulse waveform at the ascending aorta using said calibrated blood pressure pulse waveform and a predetermined transfer function;

    d. calculating the aortic flow velocity waveform from said aortic pressure pulse waveform by reference to predetermined values for age dependent impedance modulus and phase difference between said aortic pressure pulse waveform and said aortic flow velocity waveform.

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