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80 Stratos LV/LV-T Technical Manual
2.3.9.4 AV Scan Hysteresis
With AV Scan Hysteresis enabled, after 180 consecutive pacing
cycles, the AV delay is extended for the programmed number of
pacing cycles (OFF; 1…(1)…10 cycles). If an intrinsic rhythm is
detected within the extended AV delay and the longer AV delay
remains in effect. If an intrinsic rhythm is not detected within the
number of scan cycles, the original AV delay value resumes.
2.3.10 VES Discrimination after Atrial Sensed
Events
Stratos CRT-Ps have a special timing interval (VES/As) – VES
discrimination after atrial sense events to identify ventricular
extrasystoles.
With each As, a VES discrimination interval is started in the
ventricle. If a ventricular sensed event occurs within the
discrimination interval, this event is interpreted as a Vs
(ventricular sensed event), and no extended PMT protection
interval is started.
In the factory setting, the VES discrimination after As is set to
350 ms (programmable: OFF, 250 …(5)… 450 ms). The
VES/As terminates with each ventricular event.
If a ventricular event does not fall within the AV delay or the VES
discrimination interval, it is classified as a VES. A ventricular
event that is sensed within the VES discrimination interval, but
outside the AVE delay, starts a VA delay after which an atrial
paced is delivered.
2.3.11 Sense Compensation
For hemodynamic reasons, it is desirable to keep constant time
between an atrial and a ventricular contraction such that
physiological conditions are attained. To this end, the AV delay
after atrial sensing can be shortened by sense compensation.
For sense compensation, the values are programmable from
OFF, -10…(-10)…-120 ms (standard valued -50 ms). The AV
delay after an atrial sensing event is shorter by the programmed
value after pacing. The AV delay after atrial pacing then
corresponds to the programmed AV delay.