Diseases

AV node

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Of the AV node (Atrioventricular node) is the secondary pacemaker of the heart. It receives the electrical impulses coming from the sinus node via the atrial musculature and forwards them via the conduction system to the heart chambers so that they contract. Read everything important about the AV node!

ArtikelübersichtAV node

  • AV node: control center between forecourt and chamber
  • AV node as a secondary pacemaker
  • AV node as frequency filter
  • Problems around the AV node

AV node: control center between forecourt and chamber

The AV node is a region of dense, connective tissue-rich muscle fibers in the right atrium (atrium) near the ventricle. It is the only conductive connection between the atrium and the chamber: the electrical impulses coming from the sinus node via the atrial musculature spread from the AV node via the His bundle and then further over the ventricles and the Purkinje fibers to the outermost myocardial cells of the ventricles and trigger a contraction of the heart chambers (systole).

The forwarding of the signals at the AV node takes place with a short time delay. This ensures that the atria and ventricles do not contract at the same time, but in quick succession. This improves the blood filling of the ventricles: The atrial contraction forces blood from the atria into the ventricles, which in turn contract shortly thereafter, forcing the blood into the outgoing arteries.

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AV time

The time taken for the electrical impulses to pass from the sinoatrial node via the atria and the AV node to the ventricles is indicated by the physician AV time (atrioventricular conduction time). In the ECG, it roughly corresponds to the PQ interval.

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