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94 Stratos LV/LV-T Technical Manual
CAUTION
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.
2.13 AES Detection and Pacing
Post atrial extrasystoles (AES) pacing is intended to prevent the
occurrence of pro-arrhythmic long-short-long sequences due to
an atrial extrasystole, which can lead to atrial tachycardias. This
is achieved through a shortened post AES basic interval, which
is incrementally lengthened again during subsequent cycles until
the basic interval is attained.
The algorithm "Post AES Stimulation" is comprised of two parts.
First, an AES must be recognized (AES detection), and
secondly, the respective stimulation, Post AES Stimulation, must
then occur.
2.13.1 AES Detection
To detect atrial extrasystoles (AES), an "AES (timing) window" is
defined, the length of which is calculated from the averaging of
the rates of the four paced or intrinsic cardiac events prior to an
AES. The AES window is shortened by a programmable
percentage (5... (5) ...50%) from the averaged interval (nominal
setting is 25%). If an intrinsic atrial event falls within this AES
window and the coupling interval <750 ms, the cardiac event is
classified as an AES.