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DETERMINING INTERCARDIAC IMPEDANCE

  • US 20100113964A1
  • Filed: 10/31/2008
  • Published: 05/06/2010
  • Est. Priority Date: 10/31/2008
  • Status: Abandoned Application
First Claim
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1. A method of determining complex intercardiac impedance comprising:

  • propagating a modulated signal across a myocardium,wherein the modulated signal is propagated from at least one electrode to at least one sensor;

    detecting an outputted modulated signal from the myocardium; and

    using at least one circuit to reduce the influence of process noise (aggressors) in the outputted modulated signal, wherein the at least one circuit performs the steps comprising;

    amplifying the outputted modulated signal to produce a second outputted modulated signal;

    demodulating the second outputted modulated signal to produce a third outputted modulated signal; and

    passing the third outputted modulated signal through an integrator to produce a fourth outputted modulated signal,wherein amplitude and phase of the fourth outputted modulated signal indicate the complex impedance of the myocardium,wherein changes in complex impedance patterns of the myocardium provide indication of various cardiac functions and an ischemic event,wherein changes in patterns sensed by a combination of correlated sensors for specific regions of the heart provide indication of the various cardiac functions and the ischemic event.

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