Chapter 5 Programmable Parameters
Evia HF / HF-T Technical Manual
PAGE 15
Table 1: Mode Switching Parameter Summary
Intervention rate
The Intervention rate is the minimum atrial rate at which Mode Switching will occur and is
programmable by the user.
Switch to Pacing
Switch to pacing is the mode the device reverts to during Mode Switch.
Table 2 shows the choices for Mode Switch modes based on the programmed device mode.
Programmed
Device Mode
Mode Switch
Mode Options
Default Mode for
Mode Switch
DDDR-ADIR DDIR DDIR
DDD-ADI DDI,DDIR DDIR
DDD-CLS DDIR DDIR
DDDR DDIR DDIR
DDD DDI, DDIR DDIR
VDDR VDIR VDIR
VDD VDI, VDIR VDIR
Table 2: Mode Switch Mode Operations
Ventricular Pacing (Evia HF / HF-T only)
RV only or BiV pacing uses the same pacing programming values as seen under the Ventricular pacing
parameter button. With Biventricular pacing programmed ON, pacing during Mode Switch will be
Biventricular as well.
Onset Criterion
The mode switch onset criterion uses an X of 8 rolling counter with a default X value of 5. This means
that 5 out of the last 8 atrial events must be faster than the programmed intervention rate for Mode
Switch to occur.
The higher the X value, the harder it is to declare Mode Switching. Conversely, the lower the value, the
easier it is for Mode Switching to occur.
Atrial oversensing due to far-eld events sensed in the atrial channel may lead to inappropriate Mode
Switch declaration.
Evia CRT-P does not use intervals with paced events towards the mode switch count, thereby reducing
the risk of inappropriate mode switch due to sensor competition.
Resolution Criterion
The resolution criterion uses an X of 8 rolling counter with a default X value of 5. This means that 5
out of the last 8 atrial events must be slower than the programmed intervention rate for a return to the
programmed pacing mode.
To Next Page
Loading...
