BIOTRONIK Cardiac Airbag, Technical Manual, Page: 38 / 92

32 Cardiac Airbag Technical Manual
2.5.4 Gain and Threshold
The Gain defines how much the sensor signal is amplified before
it is used by the rate adaptive algorithm. The Gain is
programmed so the maximum desired pacing rate during
exercise occurs at a maximum exertion level. The Gain is preset
to 4 when programmed to the VVIR mode.
The Sensor Threshold defines the lowest sensor output that
initiates a change in the pacing rate and all motion below this
threshold is ignored by the algorithm. The Sensor Threshold is
IR mode.
rammed to
m Sensor Rate
Regardless of the sensor output, the sensor-driven pacing rate
ammable Maximum Sensor Rate. The
preset to Mean when programmed to the VV
2.5.5 Rate Increase / Decrease
The Rate Increase and Rate Decrease parameters work
together with the Gain to determine how quickly pacing rate
increases or decreases to occur with changes in the sensor
output. A rate increase of 2 ppm per second would take 45
seconds to change from a pacing rate of 60 ppm to 150 ppm.
The Rate Increase is preset to 2 ppm/sec when prog
the VVIR mode. A rate decrease setting of 0.4 ppm per second
will take 225 seconds to decrease a pacing rate of 150 ppm to
60 ppm. The Rate Decrease is preset to 0.4 ppm/sec when
programmed to the VVIR mode.
2.5.6 Maximu
never exceeds the progr
maximum sensor rate only limits the pacing rate during sensor-
driven pacing. The Maximum Sensor Rate is programmable to
either 100 or 125 ppm when programmed to the VVIR mode.
2.5.7 Pulse Amplitude
The Pulse Amplitude parameter defines the amplitude in volts of
the pacing pulses. The pulse amplitude is independently set for
normal and post-shock bradycardia pacing.