70 Stratos LV/LV-T Technical Manual

During biventricular pacing in the Stratos CRT-Ps, the right ventricle is paced first. Starting from the initially paced chamber (RV), the intraventricular conduction time (VV delay) is permanently set to 5 ms after a right ventricular sensed or paced event.

NOTE:

While ventricular pacing and sensing events are synchronized, synchronization does not occur during ventricular extrasystoles.

The following table presents in detail the effects of the standard pacing modes with the biventricular modes:

Table 19. Biventricular Pacing Modes

Biventricular Pacing Modes

(BiV RV RV/T)

 

DDD

VDD

DDI

VDI

VVI

DDD

VDD

DDI

VDI

 

 

 

 

 

 

 

 

 

 

RVs inhibits RVp

X

X

X

X

X

X

X

X

X

RVs triggers LVp

X

X

X

X

X

X

X

X

X

2.3Timing Functions

The availability of parameters and parameter values is determined by the software used for programming / interrogating the CRT-Ps.

2.3.1 Basic Rate

The basic rate is the pacing rate in the absence of an intrinsic rhythm and is programmable up to 180 ppm. The interval for the basic rate is the time between two pacing pulses and is thus called the basic interval.

The basic rate is programmable:

32… (1)…60… (1)…88… (2)…122… (3)…140… (5)…180 ppm.

In atrial-controlled modes, the basic interval is started by an atrial event. In atrial-controlled, dual-chamber modes, the basic interval is also started by a ventricular extrasystole.