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Chapter 10 Follow-up Procedures
Evia HF / HF-T Technical Manual
PAGE 109
of work load or if the selected maximum sensor rate is achieved at too low of an exercise level, the
sensor gain should be reduced by selecting a lower gain setting. If, on the other hand, rate adaptation
is insufficient for a specific amount of workload, selection of a higher gain setting may be indicated. The
memory functions can be used to record the pacing rate during exercise.
The sensor rate forecast function facilitates optimization of the rate-adaptive parameters.
10.7.3 Adjusting the Sensor Threshold
The sensor threshold controls the (motion) signal level that has to be exceeded to cause a rate
increase. This parameter is meant to assure a stable pacing rate at rest and to prevent rate increases
at signal levels not consistent with physical exertion. The sensor gain should be optimized prior to
adjusting the sensor threshold. Otherwise, changing of the gain setting will cause changes in the
effective threshold.
If rate increase is caused by low level activities, when no rate-adaption is desired, the sensor threshold
setting should be increased by selecting the next higher setting (e.g., low to mean). If, on the other
hand, the pulse generator tends to respond only at higher levels of work, a reduction of the sensor
threshold may be indicated (e.g., high reduced to mean). It may be useful to record a sensor test trend
for evaluation of sensor response. The sensor rate forecast may also be used to tailor the sensor
threshold to the patient.