Glossary

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V

V-A interval. In dual chamber pacing (DDD and DVI), it is the period of time be­tween a ventricular event (sensed or paced) to the next scheduled atrial output pulse.  This interval is often called the atrial escape interval.

Ventricular safety pacing. In some A-V sequential (DVI) and A-V universal (DDD) pacemakers, following atrial pacing, the pacemaker is designed to trigger a ventricular pacing output if ventricular sens­ing occurs during the first portion (e.g. 110 ms) of the programmed A-V interval.  This feature ensures a ventricular depolarization if the event sensed was electrical interference. If the sensed event was a ventricular depolarization then the output will be delivered during a safe part of the cardiac cycle.