Is there any advantage for dual chamber AV sequential pacing?

In dual chamber AV sequential pacing, the atria are paced initially and the ventricles are paced after a delay. This facilitates ventricular filling by atrial contraction. This is more important in those with stiff ventricles. Normally atrial contraction contributes to only about 15% of ventricular filling. But in a ventricle with difficulty in relaxing, atrial contribution may be as high as 30%.

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