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Transthoracic impedance measurement in a subcutaneous device

  • US 7,720,534 B2
  • Filed: 09/28/2006
  • Issued: 05/18/2010
  • Est. Priority Date: 09/18/2000
  • Status: Expired due to Fees
First Claim
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1. A method of treating a patient comprising:

  • providing a cardiac stimulus system comprising a canister housing operational circuitry and a lead assembly coupled to the canister, the operational circuitry including sense circuitry for sensing patient cardiac function and delivery circuitry for delivering cardiac stimulus to the patient; and

    implanting the cardiac stimulus system into a patient such that the canister and lead assembly are disposed internal to the patient with no transvenous, intracardiac, or epicardial electrodes;

    wherein the cardiac stimulus system is configured to perform the following;

    observing transthoracic impedance of the patient to determine whether respiration is occurring;

    identifying a cardiac condition of the patient indicating need for cardiac stimulus; and

    if cardiac stimulus is needed, delivering one or more electrical stimuli to the patient'"'"'s heart using at least the lead assembly.

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