User Manual Part 2

PACING THERAPIES
BASIC PARAMETERS
5-13
Maximum Sensor Rate (MSR)
MSR is the maximum pacing rate allowed as a result of sensor control from
accelerometer input.
The following considerations are important when programming MSR:
• Patient’s condition, age, and general health:
– Adaptive-rate pacing at higher rates may be inappropriate for patients
who e xperience angina or other symptoms of m yocardial ischemia at
these higher rates
– An appropriate MSR should be selected based on an assessment of
the highest pacing rate that the patient can tolerate well
• Interactive limits ("Lower Rate Limit (LRL)" on page 5-10)
NOTE: If the pulse generator is operating in DDD(R) or VDD(R) mode, the
MSR and MTR may be programmed independently to different values.
MSR is independently programmable at, above, or below the MTR. If the MSR
settingishigherthantheMTR,apacingrateabovetheMTRmayoccurin
the presence of high activity levels.
Pacing above the MSR can only occur in response to sensed intrinsic atrial
activity.
With 1:1 conduction, the pulse generator maintains the A–A pacing rate by
extending the V–V pacing rate. This extens ion is determined by the degree of
difference between the AV Delay and the intrinsic ventricular conduction—often
referred to as modified atrial-based timing (Figure 5-1 on page 5-14).
- DRAFT -