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Monitor of heart failure using bioimpedance

  • US 8,731,653 B2
  • Filed: 10/09/2009
  • Issued: 05/20/2014
  • Est. Priority Date: 10/10/2008
  • Status: Active Grant
First Claim
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1. A method of monitoring pulmonary edema in a human being, the method comprising:

  • injecting an electrical current between a first electrode located in or around a heart and a housing of a medical device implanted in a chest region;

    measuring a voltage potential between a second electrode in a superior vena cava and a third electrode in the superior vena cava, the voltage potential created by the electrical current;

    measuring a second voltage potential between a fourth electrode in the superior vena cava and either the second electrode or the third electrode; and

    assessing pulmonary edema based on (A) a first impedance value calculated from the electrical current and the voltage potential and a stored edema threshold impedance value and (B) a second impedance value calculated based on the electrical current and the second voltage potential.

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