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Thoracic or intracardiac impedance detection with automatic vector selection

  • US 20060241512A1
  • Filed: 04/20/2005
  • Published: 10/26/2006
  • Est. Priority Date: 04/20/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • measuring a first impedance signal between at least first and second electrodes, which define a first electrode configuration, in a subject'"'"'s thorax;

    extracting a first cardiac stroke signal from the first impedance signal;

    extracting a first respiration signal from the first impedance signal;

    extracting a first cardiac amplitude measurement from the first cardiac stroke signal;

    extracting a first respiration amplitude measurement from the first cardiac stroke signal;

    computing a first comparative measurement between the first cardiac amplitude measurement and the first respiration amplitude measurement;

    measuring a second impedance signal between at least third and fourth electrodes, which define a second electrode configuration, in a subject'"'"'s thorax, wherein at least one of the third and fourth electrodes is a different electrode from at least one of the first and second electrodes;

    extracting a second cardiac stroke signal from the second impedance signal;

    extracting a second respiration signal from the second impedance signal;

    extracting a second cardiac amplitude measurement from the second cardiac stroke signal;

    extracting a second respiration amplitude measurement from the second cardiac stroke signal;

    computing a second comparative measurement between the second cardiac amplitude measurement and the second respiration amplitude measurement; and

    using the first and second comparative measurements as a basis for selecting one of the first and second electrode configurations for subsequent extraction of at least one of the respiration and cardiac stroke signals.

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