User Manual Part 1

PACING T HERAPIES
SENSORS AND TRENDING
5-15
Activity Threshold
MSR
Paced rate
LRL
Rest Stage 1 RestStage 2
Time
Lower threshold
setting
Higher threshold
setting
Nominal threshold
setting
This figure d emonstrates the effect of increased or decreased Activity Threshold settings in
response to a theoretical two-stage exercise test.
Figure 5-5. Activity Thresho ld in exercise test
Reaction Time
Reaction Time de termines how quickly the pacing rate will rise to a new level
once an increase in activity level is detected.
Reaction Time affects only the time required for a rate increase to occur. The
value selected determines the time required for the paced rate to move from
the LRL to the MSR for a maximum level of activity (Figure 5-6 on page 5-16
and Figure 5-7 on page 5-16).
• Short Reaction Time: results in a rapid increase in the pacing rate
• Long Reaction Time: results in a slower increase in 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
- DRAFT -