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Stratos LV/LV-T Technical Manual 97
When the Automatic Sensor Gain is activated, the CRT-P
samples the sensor-indicated rate. If, during the 24 hour period
beginning at midnight, the total time recorded at maximum
sensor rate exceeds 90 seconds, the sensor gain setting is
reduced by one step. The sensor gain will be increased by one
step if for 7 consecutive days; the time recorded at maximum
sensor rate is less than 90 seconds each day.
2.14.4 Sensor Threshold
The effects of rate adaptive pacing are limited to sensor signals
exceeding the programmable sensor threshold. Sensor signals
below this threshold do not affect rate response (Figure 7
). The
programmable sensor threshold ensures that a stable rate at
rest can be achieved by ignoring sensor signals of low amplitude
that are not related to exertion.
If the pacing rate at rest is unstable, or tends to stay above the
lower rate without activity, the sensor threshold should be
increased. The sensor threshold should be reduced if a
sufficient rate increase is not observed at a given level of
exertion.
Figure 7 Effect of sensor threshold
2.14.5 Rate Increase
The rate increase parameter determines the maximum rate of
change in the pacing rate if the sensor signal indicates
increasing exertion.
The “rate attack” is set to standard value of 2 ppm/cycle and is
programmable (0.5; 1… (1)…6 ppm/cycle).
The programmed rate increase applies only to the
sensor-controlled operation and does not affect the rate changes
during atrial-controlled ventricular pacing.