Patent attributes
An implantable cardiac device having an impedance monitor has an impedance monitoring control. The impedance monitor includes a pulse generator that applies a current between a pair of implanted electrodes and an impedance measuring circuit that measures impedance across the implanted electrodes and provides an impedance signal during a present time that the pulse generator applies the current between the pair of implanted electrodes. The impedance monitoring control processes the impedance signal to provide impedance monitoring characteristic results and compares the results to preset standards. A control circuit varies the operating parameters of the impedance monitor responsive to the comparison of the impedance monitoring characteristic results to the present standards.
