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72 Stratos LV/LV-T Technical Manual
The rate hysteresis is deactivated in the standard setting, but
can be programmed from -5… (-5) … -90.
If Hysteresis is used in the DDI mode, the AV delay must be
programmed shorter than the spontaneous AV conduction time.
Otherwise, stimulation in the absence of spontaneous activity
occurs at the hysteresis rate instead of the lower rate.
Hysteresis is suspended during the Night Mode activated time.
Programming conflicts arise when the total decrease in rate is
below 30 ppm. Care should be exercised to avoid programming
a Night Mode rate and hysteresis that is below what is
appropriate and may be tolerated by the individual patient.
2.3.3 Scan Hysteresis
Scan hysteresis is expanded programmability of the Hysteresis
feature. Scan hysteresis searches for an underlying intrinsic
cardiac rhythm, which exists slightly below the programmed
lower rate (or sensor-indicated rate) of the CRT-P. Following
180 consecutive paced events, the stimulation rate is temporarily
decreased to the hysteresis rate for a programmed number of
beats. If a cardiac rhythm is not detected within the programmed
number of beats at the hysteresis rate, the stimulation rate
returns back to the original lower rate (or sensor-indicated rate).
Several programmable beat intervals are available to allow a
greater probability of detecting a spontaneous rhythm.
If an intrinsic cardiac rhythm is detected within the programmed
number of beats between the hysteresis rate and the lower rate,
the intrinsic rhythm is allowed and the CRT-P inhibits pacing.