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Stratos LV/LV-T Technical Manual 79
The Dynamic AV Delay is intended to mimic the physiologic,
catecholamine-induced shortening of the AV Delay with
increasing rate. It also serves for automatic
prevention/termination of “circus movement” pacemaker
mediated tachycardia and for prevention of reentrant
supraventricular tachycardia (see PMT Management section).
2.3.9.2 AV Hysteresis
AV Hysteresis allows a user-programmable change in AV delay
that is designed to encourage normal conduction of intrinsic
signals from the atrium into the ventricles. An AV hysteresis
interval can be programmed OFF or a value range of
10…(10)…1000. With AV hysteresis enabled, the AV delay is
extended by a defined time value after sensing a ventricular
event. The long AV interval is used as long as intrinsic
ventricular activity is detected. The programmed short AV delay
interval resumes after a ventricular paced event.
CAUTION
AV Hysteresis – If the AV hysteresis is enabled along with
the algorithm for recognizing and terminating PMTs (PMT
management), the AV delay for recognizing and terminating a
PMT has a higher priority than the AV hysteresis.
2.3.9.3 AV Repetitive Hysteresis
With AV Repetitive Hysteresis, the AV delay is extended by a
defined hysteresis value after sensing an intrinsic ventricular
event. When a ventricular stimulated event occurs, a long AV
delay is used for the programmed number of cycles. (OFF;
1…(1)…10 cycles). If an intrinsic rhythm occurs during one of
the repetitive cycles, the long duration AV delay interval remains
in effect. If an intrinsic rhythm does not occur during the
repetitive cycles, the original AV delay interval resumes.