BIOTRONIK Lumax DR ICD Series, Technical Manual, Page: 98 / 176

90 Lumax Technical Manual
2.9.5.3 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 … 10). 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.
2.9.5.4 Negative AV Hysteresis
With Negative AV Hysteresis, the AV delay is decreased by a
programmable value (10 … (10) …150 ms) after a ventricular
event is sensed, thereby promoting ventricular pacing. The
shorten AV interval is used for one time.
2.9.5.5 Negative AV Repetitive Hysteresis
With AV Repetitive Hysteresis and negative AV Hysteresis, the AV
delay is shortened by a defined hysteresis value after sensing an
intrinsic ventricular event as described above. The short AV Delay
will retain until the programmed number of cycles has elapsed.
(OFF,1 … 180). The normal AV delay resumes after the
programmed number of consecutive ventricular paced events
(Repetitive Negative AV Hysteresis) elapses.
C
AUTION
Negative AV Hysteresis – This feature insures ventricular
pacing, a technique which has been used in patients with
hypertrophic obstructive cardiomyopathy (HOCM) with normal
AV conduction in order to replace intrinsic ventricular
activation. No clinical study was conducted to evaluate this
feature, and there is conflicting evidence regarding the
potential benefit of ventricular pacing therapy for HOCM
patients. In addition, there is evidence with other patient
groups to suggest that inhibiting the intrinsic ventricular
activation sequence by right ventricular pacing may impair
hemodynamic function and/or survival.