BIOTRONIK Lumax DR ICD Series, Technical Manual, Page: 106 / 176

98 Lumax Technical Manual
2.9.11 Rate Adaptive Pacing
W
ARNING
Rate-Adaptive Pacing – Use rate-adaptive pacing with care
in patients unable to tolerate increased pacing rates.
Lumax ICD/CRT-D allows the selection of rate-responsive pacing
modes. These modes allow the ICD/CRT-D’s bradycardia
therapy function to adapt the pacing rate to increasing or
decreasing patient physical activity, based on data collected from
a motion based sensor within the ICD/CRT-D. Separately
programmable criteria allow the clinician to control the rate of
increase and decrease of pacing, as well as the sensitivity of the
sensors in response to motion.
2.9.11.1 Sensor Gain and Threshold
The Sensor Gain defines how much the sensor signal is amplified
before it is transformed to a rate change. When the
Sensor Gain
is low (e.g., 2), a great deal of exertion is needed to cause a
significant change in sensor output (and an equal change in the
pacing rate). When the
Sensor Gain is high (e.g., 18), little
exertion is needed to increase the sensor output. Ideally, the gain
is programmed so the maximum desired pacing rate during
exercise occurs at a maximum exertion level.
The device ignores all activity that occurs below the Sensor
Threshold because the Sensor Threshold defines the lowest
sensor output that initiates a change in the pacing rate. Five
different threshold settings are available including;
VERY LOW,
LOW, MEAN, HIGH, and VERY HIGH . When the threshold is
programmed optimally, the basic rate is the effective rate while
the patient is not moving (at rest).
2.9.11.2 Rate Increase / Decrease
The Rate Increase and Decrease parameters work with the
Sensor Gain to determine how quickly the pacing rate will
increase or decrease during changes in the sensor output.