Calibration of impedance monitoring of respiratory volumes using thoracic D.C. impedance
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United States of America Patent
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Oct 13, 2009
Grant Date -
Oct 26, 2006
app pub date -
Apr 26, 2005
filing date -
Apr 26, 2005
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Abstract
A system includes an implantable medical device that includes a trans-thoracic impedance measurement circuit providing a trans-thoracic impedance signal of a subject. A controller is coupled to the trans-thoracic impedance circuit. The controller extracts a respiration signal from the trans-thoracic impedance signal, measures a breathing volume of the subject using the amplitude of the respiration signal and a breathing volume calibration factor, computes an adjusted breathing volume calibration factor using a reference baseline value of the trans-thoracic impedance and a measured baseline value of the trans-thoracic impedance, and computes a calibrated breathing volume using the adjusted breathing volume calibration factor.
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