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88 Stratos LV/LV-T Technical Manual
2.8 Mode Switching
Mode switching prevents the conduction of paroxysmal
atrial tachycardias to the ventricle. Therefore, after sensing
an atrial tachycardia while in activated mode switching, the
CRT-P automatically switches to an atrial-controlled R-
mode. Like the programmed atrial-controlled P-mode, the
corresponding R-modes can be programmed:
Table 21. Mode Switching
Programmed P mode Programmed R mode in case of
sensed atrial tachycardias
DDD DDI
DDD DDIR
DDDR DDIR
VDD VDI
VDD VDIR
VDDR VDIR
DDTA DDI
DDTA DDIR
DDTAR DDIR
The Mode Switching algorithm causes the CRT-P to change
pacing modes when a programmed number of atrial intervals
(X) out of 8 consecutive atrial intervals (p-p) are faster than the
programmed mode switch intervention rate (X out of 8). X is
programmable from 3 to 8. The rate at which an atrial interval is
determined to signify an atrial tachyarrhythmia is called the
mode switch intervention rate. The mode switch intervention
rate is programmable from 100…(10)…250 bpm.