BIOTRONIK Evia DR, Technical Manual

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76 Evia Technical Manual
7.7.2 Automatic Sensor Gain
Evia pulse generators offer an Automatic Sensor Gain setting,
which allows the physician to have the Sensor Gain parameter
adjusted automatically.
When the Automatic Sensor Gain is activated, the pulse
generator samples the sensor-indicated rate (
Figure 14
). The
sensor gain will be increased by 10%, if the activity rate does not
reach or exceed the programmed activity rate (fixed to 90% of
maximum sensor rate) for 30 minutes each day over
7 consecutive days. An increase in gain cannot occur more
often than every 7 days. If, during the 24 hour period beginning
at midnight, the activity rate reaches or exceeds the
programmed activity rate (90% of maximum sensor rate) for one
hour, the sensor gain setting is reduced by 10%. A change in the
sensor gain only occurs at midnight.
N
OTE
:
If the reed switch is closed, the accumulated time at
maximum sensor rate is reset to zero, and the sensor
indicated rate measurement resumes for the period that
remains in that day.
The Automatic Sensor Gain function is primarily influenced
by the Maximum Sensor Rate setting. Therefore the
Maximum Sensor Rate must be appropriately selected.