User's Manual

75
Antitachycardia Functions
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Incremental Rate Increase and Decrease
Each time an atrial event is sensed, the pacing rate is increased by a
programmable increment (see Figure 15). This overdrive increment can
be set to either low (approx. 4 ppm), medium (approx. 8 ppm), or high
(approx. 12 ppm). If the intrinsic rate does not continue to rise after a
programmable number of cycles (the overdrive pacing plateau), the
overdrive pacing rate is reduced in increments of 1 ppm. The drop in
rate occurs each time after the programmed number of cycles has
been completed (see Figure 16). Values between 1 and 32 cycles can
be assigned to the overdrive pacing plateau.
Figure 15: Incremental rate increase in preventive overdrive pacing
The pacing rate is reduced until the next atrial event is sensed.
Subsequently, the overdrive cycle begins again with the rate increase.