Patent ID: 8108049

Claim:
A system comprising: stimulation circuitry that delivers electrical stimulation to a patient via electrodes; a memory that stores a predetermined patient-specific relationship between a parameter of the stimulation and impedance, wherein the patient-specific relationship is derived from previously measured values of impedance of the patient and values of the parameter of the stimulation that are contemporaneous with the previously-measured values of the impedance of the patient; impedance measurement circuitry that measures an impedance associated with the electrodes; and a processor configured to adjust the stimulation parameter based on the measured impedance according to the predetermined patient-specific relationship, and control the stimulation circuitry to deliver the stimulation to the patient via the electrodes according to the adjusted stimulation parameter, wherein the processor is configured to adjust the stimulation parameter according to the predetermined patient-specific relationship by applying the patient-specific relationship to the measured impedance to determine a patient-specific adjusted value of the stimulation parameter.