Cardiac cycle synchronized sampling of impedance signal
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United States of America Patent
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May 14, 2013
Grant Date -
Feb 28, 2013
app pub date -
Oct 30, 2012
filing date -
Jul 2, 2003
priority date (Note) -
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Abstract
A system comprising implantable device, the implantable medical device including an intrinsic cardiac signal sensor, an impedance measurement circuit configured to apply a specified current to a transthoracic region of a subject and to sample a transthoracic voltage resulting from the specified current, and a processor coupled to the intrinsic cardiac signal sensor and the impedance measurement circuit. The processor is configured to initiate sampling of a transthoracic voltage signal in a specified time relation to a fiducial marker in a sensed intrinsic cardiac signal, wherein the sampling attenuates or removes variation with cardiac stroke volume from the transthoracic voltage signal, and determine lung respiration using the sampled transthoracic voltage signal.
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