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.
