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Method and apparatus for monitoring and diagnosing hypertension and congestive heart failure

  • US 4,899,758 A
  • Filed: 08/02/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 01/31/1986
  • Status: Expired due to Term
First Claim
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1. A congestive heart failure monitor comprising:

  • RAM means for storing data;

    input means for receiving and storing a cardiac outputtransducer means for converting an arterial pressure to a corresponding electrical analog signal;

    analog to digital converter means for receiving said analog signal and digitizing it at a predetermined sampling rate;

    means for storing digitized samples produced by said converter means in said RAM means, said samples being stored over a time interval so that one or more pressure waves, each corresponding to a beat of the human heart, are digitized and stored in said RAM means as a series data bytes, each byte representing the instantaneous pressure of the arterial pressure;

    means for determining a mean arterial pressure value from said stored data bytes and storing said value;

    means for determining the value of the parameter C2 of the modified Windkessel model from the pulse contour of the diastolic portion of said waves and from said stored mean arterial pressure value and said stored cardiac output value;

    means for testing said C2 value against a predetermined threshold value of approximately 0.07 ml/mm Hg indicative of a congestive heart failure condition and identifying a congestive heart failure condition for C2 values below said threshold; and

    means for indicating said identified condition to a user of said vascular compliance monitor.

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