Mintek LV-T Manual Do Utilizador

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). 

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.  

 

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.