User's Manual

85
Rate Adaptation
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Figure 18: Automatic adjustment of sensor gain with a 7:1 algorithm
Sensor Threshold
The minimum strength of the signals used for rate adaptation is
determined with the programmable sensor threshold. Sensor signals
below this threshold do not affect rate adaptation (see Figure 19).
Through the programmable sensor threshold, a stable rate at rest of
the patient can be achieved by ignoring low-amplitude signals that
have no relevance for increased levels of physical exertion.
If the pacing rate at rest is unstable or reaches values that are above
the basic rate, the sensor threshold should be increased. On the other
hand, the sensor threshold should be reduced if a sufficient rate
increase is not observed with slight exertion. The sensor gain should be
adjusted before setting the sensor threshold.