VVI pacing
Pronunciation: V-V-I
Also written as: VVI — Ventricular paced, Ventricular sensed, Inhibited
Single-chamber pacemaker mode that paces and senses the ventricle only, with inhibited response to sensed ventricular activity.
Full Definition
VVI pacing is a single-chamber pacemaker operating mode described by the NBG (NASPE/BPEG Generic) pacemaker code. The first 'V' indicates ventricular pacing, the second 'V' indicates ventricular sensing, and 'I' indicates that the pacemaker is inhibited when intrinsic ventricular activity is sensed. This mode provides basic ventricular pacing support but does not maintain atrioventricular synchrony, as it does not pace or sense the atrium. VVI pacing is typically used in patients with chronic atrial fibrillation and bradycardia, or as a backup mode in more complex pacing systems.
Usage
Usage note: Part of standardized NBG pacing nomenclature; explain loss of AV synchrony.
In Context
- "The patient received a VVI pacemaker at 60 bpm for symptomatic bradycardia in the setting of chronic atrial fibrillation." — Operative summary
- "Device interrogation revealed 45% VVI pacing with appropriate sensing of intrinsic ventricular beats." — Pacemaker clinic report