Does damage to the AV node decrease heart rate?

Damage to the atrioventricular (AV) node can either increase or decrease heart rate. It depends on the nature of the damage and how it affects the AV node's function.

The AV node is a small structure located between the atria and ventricles of the heart. It acts as a gate, allowing electrical signals to pass from the atria to the ventricles in a controlled manner. If the AV node is damaged, these signals may not be able to pass through correctly, which can affect the heart rate.

Damage to the AV node can result in:

1. AV Block: In this condition, the signals from the atria are partially or completely blocked from reaching the ventricles. When the AV block is severe, it can cause a slow heart rate (bradycardia).

2. Ventricular Escape Rhythms: If the AV node is damaged and the electrical signals are blocked, the ventricles may generate their own electrical impulses to maintain a heart rhythm. These ventricular escape rhythms can result in a fast or irregular heart rate.

Therefore, damage to the AV node can have variable effects on heart rate, depending on the extent and nature of the damage, leading to either bradycardia or tachycardia.