Intermediate
Technical
IVT
AAI pacing
Single-chamber pacing mode where the pacemaker stimulates only the atrium and senses only atrial activity.
Full Definition
AAI (Atrial-Atrial-Inhibited) pacing is a single-chamber pacing mode used in patients with sinus node dysfunction but intact AV conduction. The pacemaker electrode is placed in the right atrium, and the device both paces and senses only in the atrial chamber. When intrinsic atrial activity is sensed, the pacemaker is inhibited from delivering a stimulus. This mode is contraindicated in patients with AV block as it provides no ventricular backup pacing. AAI pacing with rate response (AAIR) includes sensors to increase pacing rate with activity.
Usage
Usage note: Always spell out as AAI, not A-A-I or aai.
In Context
- "The patient with sick sinus syndrome was programmed to AAI pacing mode to preserve natural AV synchrony." — Device interrogation report
- "AAI pacing is contraindicated in this patient due to documented second-degree AV block." — Pacemaker implant note
Also known as
atrial pacing
single-chamber atrial pacing
Contrasted with
VVI pacing
dual-chamber pacing
Don't confuse with
AAI mode vs AV sequential pacing