User Manual Part 2

5-22
PACING THERAPIES
SENSORS AND TRENDING
The following programmable parameters control the pulse generator ’s response
to the sensor values generated by the Accelerometer:
• Activity Threshold
• Reaction Time
• Response Factor
• Recovery Time
Activity Threshold
Activity Threshold prevents rate increases due to low-intensity, extraneous
motion (e.g., motion caused by respiration, heart beat, or in some c ases tremor
associated with Parkinson’s disease).
Activity Threshold represents the activity level that must be exceeded before
the sensor-driven pacing rate will increase. The pulse generator will not
increase the paced rate above the LRL until the activity signal increases
above the Ac tivity Thresho ld. An Activity Threshold setting should allow a ra te
increase with minor activity, such as wa lkin g, but be high enough so the p ac ing
rate will not increase inappropriately w hen the patient is inactive (Figure 5-5 on
page 5-23, Figure 5-6 on page 5-23).
• Lower setting––less motion is required to increase the pacing rate
• Higher setting––more motion is required to increase the pacing rate
• Nominal setting––shown to be appropriate for the majority of patients in a
previous Guidant study; therefore, it is recommended for use in monitoring
the rate response prior to programming changes
NOTE: Programming the Activity Threshold for Normal Settings also changes
the corresponding selection for Post-Therapy Settings.
- DRAFT -