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Rate adaptive cardiac rhythm management device using transthoracic impedance

  • US 6,463,326 B1
  • Filed: 01/20/2000
  • Issued: 10/08/2002
  • Est. Priority Date: 02/27/1998
  • Status: Expired due to Term
First Claim
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1. A method of determining transthoracic impedance in a cardiac rhythm management device, the method comprising:

  • repeatedly delivering a multiple phase stimulus having more than two phases to a thorax region of a patient; and

    demodulating more than one phase of a response to the multiple phase stimulus to obtain sample points of a response signal including transthoracic impedance information, wherein the demodulating includes sampling a response to more than one phase of the multiple phase stimulus and combining the sampled responses.

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