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Intracardiac impedance and its applications

  • US 9,839,781 B2
  • Filed: 05/07/2013
  • Issued: 12/12/2017
  • Est. Priority Date: 08/22/2005
  • Status: Expired due to Fees
First Claim
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1. A medical device comprising:

  • a controller circuit configured to;

    receive a sensed cardiac cycle and an intracardiac impedance signal;

    determine at least two of;

    a cardiac-cycle-to-cardiac-cycle change in a value of a baseline intracardiac impedance value calculated, for a particular cardiac cycle, to represent the baseline intracardiac impedance for that particular cardiac cycle;

    a cardiac-cycle-to-cardiac-cycle change in a value of maximum intracardiac impedance value calculated, for a particular cardiac cycle, to represent the maximum intracardiac impedance value for that particular cardiac cycle;

    ora cardiac-cycle-to-cardiac-cyclea change in a slope value of an intracardiac impedance waveform signal, for a particular cardiac cycle, the slope value measured at a time corresponding to one-half of a time interval over which a maximum intracardiac impedance change occurs during the particular cardiac cycle; and

    generate an indication that the measured at least two of the cardiac-cycle-to-cardiac-cycle changes represent heart failure (HF) decompensation when the changes occur absent detection of an intervening event during the measuring of the intracardiac impedance parameters.

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