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Stratos LV/LV-T Technical Manual 95
2.13.2 Post AES Stimulation
The post AES stimulation (pacing) can be programmed for all
atrial-controlled modes (i.e., DDD(R), DDT/A(R), AAI(R) and
AAT(R). If an AES is detected, the pacemaker starts a "Post
AES Interval". The duration of the post-AES interval is equal to
the coupling interval of the Post-AES plus the "decrement step
size" (programmable 5 ... (5) ... 40 ppm). After the post AES
interval has expired, pacing occurs in the atrium. In each
subsequent cycle, the pacing rate is reduced by the value of the
"decrement step size" per stimulus until the basic rate (or sensor
rate) is again reached, or until the intrinsic cardiac rhythm takes
precedence again. The post AES stimulation is then concluded,
and it is repeated after each AES. The post-AES interval is never
shorter than the Upper Tracking Rate Interval (UTR).
Additionally, if the post-AES coupling interval is longer than the
current sensor rate, pacing occurs at the sensor rate.
NOTE:
When “preventative overdrive pacing” is activated, post-AES
pacing is not automatically activated. Both parameters can
be programmed independently of one another.
CAUTION
Post AES - Before activating post-AES, check whether the
selected program can cause Pacemaker Mediated
Tachycardia (PMT) and whether post-AES pacing results.
2.14 Parameters for Rate-Adaptive Pacing
2.14.1 Rate-Adaptation
The Stratos CRT-Ps are equipped with accelerometers that
located within the CRT-P. This sensor produces an electric
signal during physical activity of the patient. If a rate adaptive
mode is programmed, then the sensor signal controls the
stimulation rate. Sensing and inhibition remain in effect during
sensor controlled operation. In the case of high pacing rates,
however, the refractory periods may cover a majority of the lower
rate interval, resulting in asynchronous operation.