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System and method to calculate cardiac characteristics

  • US 9,867,547 B2
  • Filed: 11/19/2013
  • Issued: 01/16/2018
  • Est. Priority Date: 11/29/2012
  • Status: Active Grant
First Claim
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1. A system comprising;

  • a signal acquisition system including an interface configured to;

    receive a hemodynamic signal; and

    receive a cardiac impedance signal; and

    a processor configured to execute a system control program in a memory, the system control program causing the processor to;

    identify by the processor a first peak and a second peak of the cardiac impedance signal;

    identify by the processor a first portion of the hemodynamic signal corresponding to a full heart cycle based on the cardiac impedance signal first peak;

    identify by the processor a second portion of the hemodynamic signal corresponding to the full heart cycle based on the cardiac impedance signal second peak;

    calculate a systolic area index (SAI) cardiac characteristic based on the first portion and the second portion of the hemodynamic signal;

    the identification of the first portion of the hemodynamic signal including causing the processor to;

    employ an adaptive multi-cycle detection window by identifying at least two complete periods of the hemodynamic signal occurring within a predetermined time period, wherein the predetermined timed period is centered around the first peak of the cardiac impedance signal;

    create a weighted average of the at least two complete periods of the hemodynamic signal with adaptively controlled coefficients, wherein the adaptively controlled coefficients represent a time interval between a center of the multi-cycle detection window and a peak of the hemodynamic signal for each of the at least two complete periods of the hemodynamic signal, wherein the weighted average acts as a derived hemodynamic cycle;

    the calculation of the SAI cardiac characteristic based on the derived hemodynamic cycle;

    determine a medical diagnosis based on the calculated SAI cardiac characteristic; and

    display on an operator terminal at least one of the medical diagnosis determined by the processor and the SAI cardiac characteristic calculated by the processor.

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