The moderator band (septomarginal trabecula) is a muscular bridge that crosses the cavity of the right ventricle from the interventricular septum to the base of the anterior papillary muscle. It carries a large part of the right bundle branch. It is one of the features that identifies the right ventricle on imaging.
| Location | Lower part of the right ventricle, running from the septum to the anterior wall at the base of the anterior papillary muscle. |
|---|---|
| Parts |
|
| Blood Supply | Septal perforators of the left anterior descending artery |
Provides a short cut for the conduction system, so the anterior papillary muscle is activated early and tightens the tricuspid chordae before the ventricle contracts fully. It was once thought to limit over-distension of the ventricle, hence the name.
On echocardiography a prominent moderator band can be mistaken for a clot or tumour. Its presence is used to identify the morphological right ventricle in complex congenital heart disease. Some ventricular arrhythmias and triggers of ventricular fibrillation arise from it.
Premature beats or ventricular tachycardia originating from Purkinje fibres in the band. It can be treated by catheter ablation in selected patients.
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