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Calibration of impedance monitoring of respiratory volumes using thoracic D.C. impedance

  • US 8,200,326 B2
  • Filed: 09/10/2009
  • Issued: 06/12/2012
  • Est. Priority Date: 04/26/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • detecting a change in direct current (DC) trans-thoracic impedance;

    adjusting a breathing volume calibration factor in accordance with the change in DC trans-thoracic impedance, wherein the breathing volume calibration factor translates a measure of impedance to a measure of breathing volume, and the adjusted breathing volume calibration factor includes a ratio of a reference DC trans-thoracic impedance to a more recently measured value of the DC trans-thoracic impedance; and

    measuring breathing volume of a patient using the implantable medical device, the medical device adjusting the measured breathing volume using the breathing volume calibration factor.

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