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Stratos LV/LV-T Technical Manual  71 

In the ventricular-controlled modes, the basic interval is started 
by a ventricular event. 

Programming Modifications – Extreme programming 
changes should only be made after careful clinical 
assessment.  Clinical judgment should be used when 
programming permanent pacing rates below 40 ppm or above 
100 ppm. 

 

Rate Hysteresis can be programmed in DDD(R), DDT(R), 
DDT(R)/A, DDI(R), VDD(R), VDT(R), VDI(R), VVI(R), VVT(R), 
AAI(R) and AAT(R) modes.  Hysteresis can be programmed 
OFF or to values as low as -50 bpm.  The Hysteresis rate is 
based on the lower rate and the value of the programmable 
parameter.  Hysteresis is initiated by a sensed event.  The 
resulting Hysteresis rate is always less than the lower rate.  A 
conflict symbol (>>) will appear and transmission will be 
prohibited for Hysteresis rates which are less than 30 bpm.  The 
ability to decrease the effective lower rate through Hysteresis is 
intended to preserve intrinsic rhythm.  The Stratos CRT-Ps 
operate by waiting for a sensed event throughout the effective 
lower rate interval (Hysteresis interval).  If no sensed event 
occurs, a pacing pulse is emitted following the Hysteresis 
interval. 

In DDD(R), DDT(R)/A, DDT(R), VDD(R), VDT(R), AAT(R) and 
AAI(R) pacing modes, the hysteresis interval starts with an atrial 
sense event.  In DDI(R), VVI(R), VVT(R) and VDI(R) pacing 
modes, the hysteresis interval starts with a ventricular sense 
event.  In DDD(R), DDT(R)/A, DDT(R), VDD(R) and VDT(R) 
pacing modes, the hysteresis interval also starts with ventricular 
extrasystoles. 

If rate adaptation is active, the Hysteresis rate is based on 
the current sensor-indicated rate and the value of the 
programmable parameter.