What is the moderator band and where is it found?

The moderator band (MB, also known as the septomarginal trabecula) found in all human hearts is derived from the muscle band of the interventricular septum, begins below the septal end of the supraventricular crest, and runs toward the anterolateral wall of the ventricle [1].

What is the moderator band composed of?

The moderator band is covered externally by the endocardium that is mainly consisting of the endothelial layer of simple squamous epithelium, subendothelial layer of loose connective tissue and the subendocardial layer that connects the endocardium with myocardium.

What is the moderator band RV?

The RV moderator band is a source for Purkinje-mediated arrhythmias. PVCs and VT from the moderator band have typical morphological features that point to it as source. The RV moderator band is a source of idiopathic VF triggered by PVCs that is potentially treated with catheter ablation.

Where is the moderator band in heart?

right ventricle
In the human heart, the moderator band, or trabecula septomarginalis, is a muscle column that courses inferiorly from the right portion of the interventricular septum to the base of the anterior papillary muscle of the right ventricle This muscular structure is crossed by one or more arteries, which come from the …

What is a prominent moderator band?

The moderator band, also called the septomarginal trabecula, is a consistent structure in the morphologic right ventricle and can be helpful as a landmark in situations where the ventricles may be ambiguous (i.e. in some forms of congenital heart disease).

Is there a left moderator band?

Location: Also called false tendons, false chordate and left ventricular moderator bands among other names, left ventricular bands are fibromuscular structures in the left ventricle crossing the cavity or simply joining nearby trabeculations or papillary muscles left ventricle.

What artery supplies the moderator band?

The “artery of the moderator band,” a branch of the left anterior descending (LAD) artery, supplies the MB; in hearts with a prominent MB, the artery can measure up to 1000u in diameter [5,21].

What is heart IVS?

The interventricular septum (IVS, or ventricular septum, or during development septum inferius) is the stout wall separating the ventricles, the lower chambers of the heart, from one another.

What is the function of the moderator band in the heart?

The moderator band does not attach to the tricuspid valve, but acts as part of the electrical conduction pathway of the heart (part of the right bundle branch).

Which bands in the heart are thick?

The papillary muscles are thick bands and ridges of endocardial-lined myocardium that project into the lumen of the cardiac ventricles. They essentially represent dominant ventricular trabeculae which attach to the cusps of the atrioventricular valves via the chordae tendineae.