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BODY-WORN SYSTEM FOR CONTINUOUS, NONINVASIVE MEASUREMENT OF CARDIAC OUTPUT, STROKE VOLUME, CARDIAC POWER, AND BLOOD PRESSURE

  • US 20140249434A1
  • Filed: 12/28/2011
  • Published: 09/04/2014
  • Est. Priority Date: 12/28/2010
  • Status: Abandoned Application
First Claim
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1. A method for determining cardiac power from a patient using a body-worn device, the method comprising:

  • measuring an ECG waveform from a first portion on the patient'"'"'s body with an ECG module comprising;

    i) at least two electrodes; and

    ii) an ECG circuit configured to process signals from the at least two ECG electrodes to generate the ECG waveform;

    measuring a trans-brachial electro-velocimetry (TBEV) waveform from a second portion on the patient'"'"'s body with an impedance module comprising;

    i) at least two impedance electrodes; and

    ii) an impedance circuit configured to process signals from the at least two impedance electrodes to generate the TBEV waveform;

    measuring a photoplethysmograph (PPG) waveform from a third portion on the patient'"'"'s body with an optical module comprising;

    i) an optical probe; and

    ii) an optical circuit configured to process signals from the optical probe to generate the PPG waveform;

    processing the TBEV waveform to determine a TBEV time-dependent component;

    processing the TBEV waveform to determine a (dZ/dt)max value;

    processing the PPG waveform to determine a PPG time-dependent component;

    processing the ECG waveform to determine an ECG time-dependent component;

    processing at least one of the ECG waveform, the TBEV waveform, and the PPG waveform to determine a heart rate value;

    determining a SFT value by processing at least one of;

    i) the PPG waveform;

    ii) the TBEV waveform; and

    iii) the ECG waveform;

    determining a stroke volume value by processing SFT and the (dZ/dt)max value;

    determining a blood pressure value by processing a transit time value determined from at least one of;

    i) the PPG time-dependent component and the ECG time-dependent component;

    ii) the TBEV time-dependent component and the PPG time-dependent component; and

    iii) the ECG time-dependent component and the TBEV time-dependent component; and

    collectively processing the blood pressure value, the stroke volume value, and the heart rate value to determine the cardiac power value.

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