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Method and apparatus for controlling cardiac resynchronization therapy using cardiac impedance

  • US 20070066905A1
  • Filed: 09/21/2005
  • Published: 03/22/2007
  • Est. Priority Date: 09/21/2005
  • Status: Active Grant
First Claim
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1. A machine-assisted method for monitoring a heart having first and second ventricles, the method comprising:

  • measuring a first impedance signal, the first impedance signal being substantially indicative of a volume of the first ventricle as the first ventricle expands and contracts during a cardiac cycle of the heart;

    measuring a second impedance signal, the second impedance signal being substantially indicative of a volume of the second ventricle as the second ventricle expands and contracts during the cardiac cycle;

    detecting a first peak of the first impedance signal during the cardiac cycle, the first peak being a first point at which the first impedance signal reaches a first maximum value;

    detecting a second peak of the second impedance signal during the cardiac cycle, the second peak being a second point at which the second impedance signal reaches a second maximum value; and

    producing a first resynchronization index parameter using at least the first and second peaks, the resynchronization index parameter indicative of a degree of cardiac mechanical synchrony or asynchrony between the first and second ventricles.

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