Heart; conduction system. 1. SA node. 2. AV node. 3. Bundle of His. 8. Septum
Image showing the conduction system of the heart. The AV node is labelled 2.
Ventricular fibrillation (VF) showing disorganized electrical activity producing a spiked tracing on an electrocardiogram (ECG)
Overview of the system of electrical conduction which maintains the rhythmical contraction of the heart
Isolated heart conduction system showing atrioventricular node
Broad classification of arrhythmias according to region of heart required to sustain the rhythm
Normal sinus rhythm, with solid black arrows pointing to normal P waves representative of normal sinus node function, followed by a pause in sinus node activity (resulting in a transient loss of heartbeats). Note that the P wave that disrupts the pause (indicated by the dashed arrow) does not look like the previous (normal) P waves – this last P wave is arising from a different part of the atrium, representing an escape rhythm.
Principle of ECG formation. Note that the red lines represent the depolarization wave, not bloodflow.
Different wave shapes generated by different parts of the heart's action potential

The atrioventricular node or AV node electrically connects the heart's atria and ventricles to coordinate beating in the top of the heart; it is part of the electrical conduction system of the heart.

- Atrioventricular node

The pacemaking signal generated in the sinoatrial node travels through the right atrium to the atrioventricular node, along the Bundle of His and through bundle branches to cause contraction of the heart muscle.

- Electrical conduction system of the heart

Dysfunction of the conduction system can cause irregular heart rhythms including rhythms that are too fast or too slow.

- Electrical conduction system of the heart

Arrhythmias are due to problems with the electrical conduction system of the heart.

- Arrhythmia

This also protects the ventricles from excessively fast rate response to atrial arrhythmias (see below).

- Atrioventricular node

The impulse initially causes both atria to contract, then activates the atrioventricular node (AV node), which is normally the only electrical connection between the atria and the ventricles (main pumping chambers).

- Arrhythmia
Heart; conduction system. 1. SA node. 2. AV node. 3. Bundle of His. 8. Septum

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