Patent ID: 6128534
Filing Date: 2000-10-03
Classification: A61N

Abstract:
In an implantable stimulation device, a method of automatically adjusting a desired pacing parameter to mimic natural diurnal fluctuations, the device having a sensor capable of sensing a physiological parameter having circadian variations, the method comprising:determining a daytime and a nighttime value for the desired pacing parameter;sensing the physiological parameter for a predetermined period of time;deriving, from the sensed physiological parameter, an average daytime and an average nighttime value for the physiological parameter;determining a circadian-based function based on the daytime and the nighttime value of the desired pacing parameter, and based on the average daytime and nighttime value of the physiological parameter;determining a current value for the physiological parameter;determining a current circadian-based value for the desired pacing parameter based on the circadian-based function and the current value of the physiological parameter, whereby the desired pacing parameter changes diurnally as the physiological parameter changes; andadjusting the desired pacing parameter according to the circadian-based value.