Mintek Pacemaker LV-T ユーザーズマニュアル

64  Stratos LV/LV-T Technical Manual   

In the case of ventricular sensed events outside of the AV delay 
and the VES discrimination interval after a ventricular 
extrasystole (VES or PVC), the basic interval starts without 
simultaneously starting an AV delay.  To protect the atrium from 
retrograde conduction, an extended PMT protection window is 
started at the same time as the basic interval.  If an atrial sensed 
event does not occur within the basic interval (but outside the 
refractory period), atrial pacing occurs after the basic interval 
has elapsed, and the basic interval and AV delay are restarted.  
Upon an atrial paced event, the AV safety interval starts with a 
long basic interval.  If a ventricular sensed event occurs within 
the AV delay, ventricular pacing is inhibited. 

 summarizes the intervals initiated by sensing or 

pacing.  The table distinguishes between two kinds of ventricular 
sensed and ventricular paced events: VP at the end of the AV 
delay; VP at the end of the safety AV delay, referred to as 
ventricular safety pace (V

SP

); V

S

 within the AV delay; and V

S

 

outside of the AV delay, referred to as “ventricular extrasystole” 
(VES). 

Basic interval 
(DDD)

*

 

X X 

 

 

 

 

X 

Basic interval 
(DDI)

†

 

 

 

 

X 

 

X X 

Atrial refractory 
period

‡

 

X X  X   

 

 

 

Upper basic rate   

 

 

X X  X  X 

Ventricular 
Refractory 
Period 

 

 

 

X X  X  X 

                                                      
 

*

 This timing interval is also applicable to the following modes: DDD(R), VDD(R), 

AAI(R), DDT, VDT, AAT, DOO(R) and AOO(R) 

†

 In DDI(R), DVI(R), VVI(R), DVT(R), DDI/T(R) and V00(R) lower rate timing 

starts with Vp, and/or Vs, and/or Vs event outside of the AV delay and the VES 
discrimination window (VES). 

‡

 In DDI(R), DDI/T, VDD(R), and VDT, the atrial refractory period will also be 

reset upon time-out of the VA-interval whether or not an atrial pulse is emitted.