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Detecting worsening heart failure based on impedance measurements

  • US 8,255,046 B2
  • Filed: 07/31/2008
  • Issued: 08/28/2012
  • Est. Priority Date: 07/31/2008
  • Status: Active Grant
First Claim
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1. A method comprising:

  • periodically determining, using a medical device, an impedance of a patient based on measured impedances;

    comparing each of the determined impedances to a respective reference impedance, wherein the respective reference impedance for each of the determined impedances is determined based on a plurality of previously determined impedances;

    generating an index based on the comparisons between the determined impedances and the reference impedances;

    determining a variability value based on the plurality of previously determined impedance values;

    modifying the index over time based on the variability value and the comparisons between the determined impedances and the reference impedances;

    comparing the index to at least one threshold; and

    determining whether to provide an alert based on the comparison of the index to the at least one threshold.

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