What is one of the main functions of the AAI pacemaker?

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An AAI pacemaker paces and senses the atrium and inhibits pacing when it detects intrinsic atrial activity. The ventricle is activated by the heart’s own conduction system, so the device’s primary benefit is preserving the timing between atrial contraction and ventricular contraction when AV conduction is intact. In other words, maintaining atrioventricular synchrony is the key function, because it ensures the atrial kick optimally contributes to ventricular filling without forcing ventricular pacing. Pacing the ventricle isn’t part of this mode, and while the atrium pacing capability exists, the main advantage described for this configuration is the maintenance of AV synchrony.