In atrial fibrillation, the AV node attempts to protect the ventricles from the hundreds of impulses bombarding it per minute by blocking many of the impulses generated by the irritable sites in the atria.

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In atrial fibrillation, the AV node attempts to protect the ventricles by controlling the number of impulses that reach the ventricles by blocking many of the impulses generated by the irritable sites in the atria.

In Atrial Fibrillation, the AV Node Attempts to Protect the Ventricles