AV interval
Programmed delay between atrial and ventricular pacing in dual-chamber devices to optimize cardiac hemodynamics.
Full Definition
The programmable timing interval between atrial and ventricular pacing outputs in dual-chamber pacing devices, designed to optimize atrioventricular synchrony and cardiac hemodynamics. AV intervals can be separately programmed for sensed and paced atrial events, with typical values ranging from 120-250 milliseconds depending on underlying conduction and hemodynamic requirements. Modern devices offer rate-adaptive AV intervals that adjust automatically based on sensor input. Optimal AV interval programming requires consideration of intrinsic conduction, ventricular filling time, and individual patient hemodynamics. Documentation should specify both sensed and paced AV intervals along with any rate-adaptive features.
Usage
Usage note: Specify whether referring to sensed or paced AV intervals in device programming contexts.
In Context
- "The AV interval was optimized to 180ms based on echocardiographic filling patterns." — Pacemaker programming note
- "Rate-adaptive AV interval programming improved exercise capacity significantly." — Device follow-up report