Biomedical Engineering Reference
In-Depth Information
the AVI, it paces in the ventricle. During synchronous AV
activity, atrial timing is used in one of the manufacturer's
systems. In the case of a loss of AV synchronization, that is,
any time an event is sensed in the ventricle (e.g., spontane-
ous AV conduction occurs before the lapse of the AVI upon
premature ventricular activity, Wenckebach activity, or
mode switching), the system switches to ventricular timing.
In another manufacturer's system, the EI is timed from
one ventricular event to another during ventricular pacing.
Any time an event is sensed in the ventricle, the ventricular
timing changes to atrial. Precise pacing even during intrinsic
AV conduction is ensured by this change in timing.