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HEMODYNAMIC STATUS ASSESSMENT

  • US 20130325359A1
  • Filed: 03/18/2011
  • Published: 12/05/2013
  • Est. Priority Date: 03/18/2011
  • Status: Active Grant
First Claim
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1. A system for determining a hemodynamic status model, the system comprising:

  • a lead connector electrically connectable to at least two electrodes of at least one electric lead;

    a signal generator connected to the lead connector and configured to generate, during a period of normal hemodynamic status of a subject and in connection with a period of abnormal hemodynamic status of the subject, electric signals applicable over two electrodes of the at least two electrodes;

    a signal sensing unit connected to the lead connector and configured to sense, during the period of normal hemodynamic status of the subject and in connection with the period of abnormal hemodynamic status of the subject, resulting electric signals over two electrodes of the at least two electrodes;

    an impedance processor configured to determine a first impedance signal based on the electric signals applied and the resulting electric signals sensed during the period of normal hemodynamic status of the subject and determine a second impedance signal based on the electric signals applied and the resulting electric signals sensed in connection with the period of abnormal hemodynamic status of the subject;

    a parameter processor configured to calculate first parameter values of a set of N different impedance-derivable parameters based on the first impedance signal and calculate second parameter values of the set of N different impedance-derivable parameters based on the second impedance signal, N is a positive integer equal to or larger than two;

    a model processor configured to estimate, based on the first parameter values and the second parameter values, N+1 coefficients of a linear parametric status model

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