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System and method for evaluating risk of mortality due to congestive heart failure using physiologic sensors

  • US 6,961,615 B2
  • Filed: 02/07/2002
  • Issued: 11/01/2005
  • Est. Priority Date: 02/07/2002
  • Status: Expired due to Fees
First Claim
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1. In an implantable medical device for implant within a patient, the device having a plurality of sensors and a control unit for processing signals from the sensors, a method performed by the control unit comprising:

  • receiving signals from the sensors representative of physiological parameters of the patient detected at sub-maximal exertion levels;

    estimating the ventilatory response of the patient at maximum exertion based on the signals detected at sub-maximal exertion levels; and

    controlling at least one function of the device based on the estimated ventilatory response. wherein the step of receiving signals representative of physiological parameters of the patient includes the step of receiving signals representative of Heart Rate, Arterial Oxygen Saturation, Right Ventricular O2, Stroke Volume, Tidal Volume, and Respiration Rate; and

    wherein the step of estimating ventilatory response includes the step of calculating
    VR=(Tidal Volume−

    Respiratory Rate) /(α

    ×

    (Arterial O2 Saturation−

    Right Ventricular O2) ×

    (Heart Rate)×

    (Stroke Volume)).

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