John D. Hatlestad,Loell Boyce Moon,Jesse W. Hartley,Jeffrey E. Stahmann
申请号：
US12557372
公开号：
US08200326B2
申请日:
2009.09.10
申请国别(地区):
US
年份:
2012
代理人:
摘要：
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.
