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A method and an apparatus for performing rate responsive control in an implantable medical device using a scaling factor. Sensor data is acquired using a sensor operatively coupled with the implantable medical device. At least one setpoint for controlling a rate of therapy is generated, the setpoint

A method and an apparatus for performing rate responsive control in an implantable medical device using a scaling factor. Sensor data is acquired using a sensor operatively coupled with the implantable medical device. At least one setpoint for controlling a rate of therapy is generated, the setpoint being based upon the sensor data. A scaling factor adjustment process is performed for scaling the internal sensor data to correlate the sensor data to the setpoint. The rate of therapy is adjusted based upon the scaling factor adjustment.

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What is claimed: 1. A method for performing rate responsive control in an implantable medical device, comprising: acquiring an internal sensor data using an internal sensor operatively coupled with said implantable medical device; generating at least one setpoint for controlling a rate of therapy,

What is claimed: 1. A method for performing rate responsive control in an implantable medical device, comprising: acquiring an internal sensor data using an internal sensor operatively coupled with said implantable medical device; generating at least one setpoint for controlling a rate of therapy, said setpoint based upon said internal sensor data; performing a scaling factor adjustment process for scaling said internal sensor data to correlate said internal sensor data to said setpoint; and adjusting said rate of therapy based upon said scaling factor adjustment, wherein performing said scaling factor adjustment process further comprises: performing a rate profile optimization (RPO) process to determine a rate profile; generating an activities of daily living (ADL) setpoint based upon said RPO; increasing said ADL setpoint based upon a determination that said ADL setpoint is below a lower boundary of an acceptable therapy rate; setting an activity scaling factor to one in response to at least one of increasing said ADL setpoint and a determination that said ADL setpoint is within said lower boundary and an upper boundary of an acceptable therapy rate; calculating a multiplier of said ADL setpoint, in response to a determination that said ADL setpoint is above said upper boundary, said multiplier being egual to a factor by which said ADL setpoint is above said upper boundary; and adjusting said scaling factor to match said multiplier. 2. The method described in claim 1, wherein acquiring said internal sensor data using said internal sensor further comprises acquiring minute ventilation (MV) data. 3. The method described in claim 1, wherein generating said setpoint for controlling said rate of therapy further comprises generating an activities of daily living (ADL) setpoint based upon an average daily rate. 4. The method described in claim 3, wherein generating said setpoint based upon an activities of daily living setpoint further comprises: blending said internal data with an external data; calculating a target pacing rate for a delivery of therapy based at least partially upon at least one of said blending of said internal and extemal data and an initial setpoint therapy target pacing rate; modifying a therapy delivery rate based upon said target pacing rate; and calculating a new setpoint therapy target pacing rate as feed back for calculating a subsequent target pacing rate. 5. The method described in claim 4, wherein blending said internal data with an external data further comprises blending said internal data with activity data. 6. The method described in claim 1, wherein performing said scaling factor adjustment process for scaling said internal sensor input to correlate said internal sensor data to said setpoint further comprises performing a scaling factor adjustment upon a minute ventilation (MV) data. 7. The method described in claim 1, wherein performing said rate profile optimization process to determine a rate profile further comprises determining a rate for therapy delivery based upon at least one physiological profile of a patient. 8. The method described in claim 1, wherein generating an activities of daily living (ADL) setpoint based upon said RPO further comprises calculating an average therapy rate appropriate for a patient based upon at least one physiological profile of said patient. 9. The method described in claim 1, further comprising performing a time constant adjustment to said scaling factor, said time constant adjustment comprising calculating a time constant relating to interpolating an ADL setpoint value by tracking an average heart excursion. 10. A method for performing rate responsive control in an implantable medical device, comprising: acquiring minute ventilation data using an internal sensor operatively coupled with said implantable medical device; generating at least one activities of daily living (ADL) setpoint for controlling a rate of therapy, said ADL setpoint based upon said minute ventilation; performing a scaling factor adjustment process for scaling said minute ventilation data to correlate said internal sensor data to said setpoint; and adjusting said rate of therapy based upon said scaling factor adjustment, wherein performing said scaling factor adjustment process further comprises: performing a rate profile optimization (RPO) process to determine a rate profile; generating an activities of daily living (ADL) setpoint based upon said RPO; increasing said ADL setpoint based upon a determination that said ADL setpoint is below a lower boundary of an acceptable therapy rate; setting an activity scaling factor to one in response to at least one of increasing said ADL setpoint and a determination that said ADL setpoint is within said lower boundary and an upper boundary of an acceptable therapy rate; calculating a multiplier of said ADL setpoint in response to a determination that said ADL set point is above said upper boundary, said multiplier being equal to a factor by which said ADL setpoint is above said upper boundary; and adjusting said scaling factor to match said multiplier. 11. An apparatus for performing rate responsive control in an implantable medical device, comprising: means for acquiring an internal sensor data using an internal sensor operatively coupled with said implantable medical device; means for generating at least one setpoint for controlling a rate of therapy, said setpoint based upon said internal sensor data; means for performing a scaling factor adjustment process for scaling said internal sensor data to correlate said internal sensor data to said setpoint; and means for adjusting said rate of therapy based upon said scaling factor adjustment, wherein the means for performing said scaling factor adjustment process further comprises: performing a rate profile optimization (RPO) process to determine a rate profile; generating an activities of daily living (ADL) setpoint based upon said RPO; increasing said ADL setpoint based upon a determination that said ADL setpoint is below a lower boundary of an acceptable therapy rate; setting an activity scaling factor to one in response to at least one of increasing said ADL setpoint and a determination that said ADL setpoint is within said lower boundary and an upper boundary of an acceptable therapy rate; calculating a multiplier of said ADL setpoint, in response to a determination that said ADL setpoint is above said upper boundary, said multiplier being equal to a factor by which said ADL setpoint is above said upper boundary; and adjusting said scaling factor to match said multiplier. 12. A computer readable medium having computer-executable instructions for performing a method, comprising: acquiring an internal sensor data using an internal sensor operatively coupled with said implantable medical device; generating at least one setpoint for controlling a rate of therapy, said setpoint based upon said internal sensor data; performing a scaling factor adjustment process for scaling said internal sensor data to correlate said internal sensor data to said setpoint; and adjusting said rate of therapy based upon said scaling factor adjustment, wherein performing a scaling factor adjustment process further comprises: performing a rate profile optimization (RPO) process to determine a rate profile; generating an activities of daily living (ADL) setpoint based upon said RPO; increasing said ADL setpoint based upon a determination that said ADL setpoint is below a lower boundary of an acceptable therapy rate; setting an activity scaling factor to one in response to at least one of increasing said ADL setpoint and a determination that said ADL setpoint is within said lower boundary and an upper boundary of an acceptable therapy rate; calculating a multiplier of said ADL setpoint, in response to a determination that said ADL setpoint is above said upper boundary, said multiplier being equal to a factor by which said ADL setpoint is above said upper boundary; and adjusting said scaling factor to match said multiplier. 13. The computer readable medium described in claim 12, wherein acquiring said internal sensor data using said internal sensor further comprises acquiring minute ventilation (MV) data. 14. The computer readable medium described in claim 12, wherein generating said setpoint for controlling said rate of therapy further comprises generating an activities of daily living (ADL) setpoint based upon an average daily rate. 15. The computer readable medium described in claim 12, wherein generating said setpoint based upon an activities of daily living setpoint further comprises: blending said internal data with an external data; calculating a target pacing rate for a delivery of therapy based at least partially upon at least one of said blending of said internal and external data and an initial setpoint therapy target pacing rate; modifying a therapy delivery rate based upon said target pacing rate; and calculating a new setpoint therapy target pacing rate as feedback for calculating a subsequent target pacing rate. 16. The computer readable medium described in claim 15, wherein blending said internal data with an external data further comprises blending said internal data with activity data. 17. The computer readable medium described in claim 12, wherein performing said scaling factor adjustment process for scaling said internal sensor input to correlate said internal sensor data to said setpoint further comprises performing a scaling factor adjustment upon a minute ventilation, (MV) data. 18. The computer readable medium described in claim 12, wherein performing said rate profile optimization process to determine a rate profile further comprises determining a rate for therapy delivery based upon at least one physiological profile of a patient. 19. The computer readable medium described in claim 12, wherein generating an activities of daily living (ADL) setpoint based upon said RPO further comprises calculating an average therapy rate appropriate for patient based upon at least one physiological profile of said patient. 20. The computer readable medium described in claim 12, the method further comprising performing a time constant adjustment to said scaling factor, said time constant adjustment comprising calculating a time constant relating to interpolating an ADL setpoint value by tracking an average heart excursion.