METHOD AND SYSTEM FOR OPTIMIZING ACTIVITY THRESHOLD IN ACTIVITY BASED RATE ADAPTIVE PACEMAKERS

摘要

pacemaker may automatically adjust to optimum values ​​the activity threshold setting of its processing circuit activity detector signal. According to one embodiment, the pacemaker maintains a running average of the length of zero value and a cumulative aggregation activity of the zero value of activity duration for a predetermined period. Pacemaker periodically calculates a time difference between the moving average of the length of zero value and the cumulative aggregation activity of the same duration, and sets the threshold of activity of the activity sensor signal processing circuit according this calculation. Insofar adjusting the activity threshold is based on the long-term average of the value of zero activity duration, the effects of the cycle to cycle variation in the activity of zero duration are minimized. According to another embodiment, the pacemaker calculates a time difference between a preset value and the marginal cumulative summation of zero valued activity duration. If the time difference is less than the predetermined margin, the activity threshold is increased. If the time difference is greater than the predetermined margin, the activity threshold is reduced.