BIOTRONIK Evia DR, Technical Manual

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84 Evia Technical Manual
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The function is deactivated when the mean of the atrial
rate over a period of twelve hours exceeds the average
safety rate (“overdrive average rate limit = OAR”). The
average safety rate is determined indirectly from the
maximum overdrive pacing rate (MOR minus 10ppm). If
the average safety rate is exceeded, the pacing rate is
incrementally reduced to the basic rate. If the average
atrial heart rate falls below the average safety rate, the
preventive overdrive pacing is reactivated
(activation/deactivation only in a 12 hour rhythm).
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If the function is deactivated for a third time because the
average safety rate has been exceeded, overdrive
pacing remains OFF permanently. The overdrive mode
can not be reactivated until after the pacemaker has
been programmed.
C
AUT IO N
Overdrive Pacing Mode -
When programming the overdrive
pacing mode, check whether the selected program can cause
PMT, and whether atrial over drive pacing would result.
Corresponding to the measured retrograde conduction time,
the PMT protection interval must be programmed to a correct
value.
7.11 Management of Specific Scenarios
7.11.1 PMT Management
A PMT is defined as a tachycardia caused by inadvertently
tracking retrograde P-waves. The PMT management feature
includes PMT Protection/Termination and a programmable PMT
detection and termination algorithm.