Moderator band radiology

Heart Lorna P.

The second image shows spatial arrangement of the moderator band and anterior tricuspid papillary muscles. The yellow arrow points to the moderator band, stretching across the right ventricular cavity. The smaller brown arrow points to an anterior papillary muscle underneath. The right ventricle wall attachment of the moderator band joins the base of the anterior tricuspid papillary muscle. Q: How is recognition of the moderator band useful?

Moderator band radiology

Metrics details. In the right ventricle RV , the septomarginal trabecula SMT arises as a muscular band originating from the interventricular septum IVS at the lower segment of the crista supraventricularis. It forms a functional unit with the moderator band, which attaches to the lateral free wall of the RV [ 1 , 2 ]. Strategically situated between the RV inflow and outflow tracts, the whole unit serves to help emptying blood into the pulmonary trunk during systole. Thus, it should be anticipated that the SMT may undergo changes in RV hypertrophy secondary to chronic pulmonary hypertension. Imaging was performed in two centers; one using 3 T and the other using 1. Short axis cine images were acquired using fast gradient echo technique. End diastolic frames were analyzed using MASS 6. Starting from the basal slices, the SMT was identified in patients and controls as the most anterior trabeculation arising from the IVS below the outflow tract level. Two independent observers manually contoured and traced the SMT from its origin towards the apex where the moderator band and secondary trabeculation arise. SMT mass in grams was derived from the volume based on a myocardial density of 1. Epicardial and endocardial ventricular borders were semi-automatically contoured for quantification of ventricular mass and functional indices. Ventricular mass index [ratio of RV over left ventricular LV mass] was derived for all groups. The Mann-Whitney test was used for direct comparisons.

End diastolic frames were analyzed using MASS 6. LVleft ventricle; RVright ventricle.

Multiple bands and bandlike structures can be found within the cardiac chambers, which can be evaluated with various imaging modalities including echocardiography, CT, MRI, and invasive angiography. These bands can be classified as normal structures or normal variants, aberrant structures, or pathologic entities. Normal structures include the crista terminalis, taenia sagittalis, Chiari network, coumadin ridge, moderator band, papillary muscles, and chordae tendineae. Aberrant structures include aberrant papillary muscles, accessory chordae, false tendons, and accessory mitral valve tissue. Pathologic entities include double-chambered right ventricle, double-chambered left ventricle, cor triatriatum, and subaortic stenosis.

Federal government websites often end in. The site is secure. The moderator band in the right ventricle is being increasingly recognised as a source for arrhythmias in the absence of identifiable structural heart disease. Because it carries part of the conduction system from the right ventricle septum to the free wall, it is a source of Purkinje-mediated ventricular arrhythmias that manifest as premature ventricular contractions PVC or repetitive ventricular tachycardia. More importantly, short coupled PVCs triggering polymorphic ventricular tachycardia and VF have been localised to the moderator band and ablation of these Purkinje mediated PVCs can effectively prevent recurrent VF. The exact mechanism of arrhythmogenesis is still debated but stretch, fibrosis and ion channel alterations might be responsible. Arrhythmias originating in this region of the right ventricle may thus be another cause for idiopathic VF that is potentially treatable with catheter-based ablation techniques. Recognition of the typical PVC morphology can point to the moderator band as the source of idiopathic VF and an opportunity for timely intervention. The available data on the anatomy, electrophysiology and management options are reviewed. Ventricular arrhythmias are designated idiopathic when demonstrable structural heart disease, significant coronary disease including coronary spasm or genetic arrhythmia syndromes are absent.

Moderator band radiology

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. 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. Blood supply typically originates from septal perforating branches of the left anterior descending artery LAD which may subsequently anastomose with vessels derived from the right coronary circulation. Articles: Right ventricle Congenital heart disease in echocardiography an approach Arrhythmogenic right ventricular cardiomyopathy Point-of-care ultrasound curriculum Intracardiac thrombus Papillary muscles Four chamber cardiac view fetal Cases: Moderator band Pulmonary atresia with ventricular septal defect and situs inversus totalis. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Edit article. Citation, DOI, disclosures and article data.

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Such division is useful when trying to localize ventricular septal defects VSDs. Once the cardiac segmental anatomy is established, the interatrial and interventricular septa are assessed for defects, and the great vessels are interrogated for stenoses or other abnormalities. Surgical repair of congenital mitral stenosis involves valvuloplasty and often later valve replacement surgery. The two endocardial cushions are located between the primitive atria and ventricles. Muscle band in the right ventricle of the heart. One additional portion of the outlet septum is termed the membranous septum, which is a very small portion of the septum that lies between the pulmonary valve annulus and inferior aspect of the tricuspid valve annulus. A The MB usually originated from a single root. Muscular defects may appear anywhere throughout the muscular portion of the ventricular septum. The RV forms most of the inferior border of the cardiac silhouette on frontal chest radiographs. Published online Mar

Multiple bands and bandlike structures can be found within the cardiac chambers, which can be evaluated with various imaging modalities including echocardiography, CT, MRI, and invasive angiography.

Gray's Anatomy: the anatomical basis of clinical practice. Get Clinical Tree app for offline access. Also noted is an extracardiac Fontan F shunt. Hurst's the heart. The MBs that had a distinct shape were classified into three types according to their shape: cylindrical column, long and thin column, and wide and flat column. The tricuspid valve has three leaflets, including the septal leaflet attached to the interventricular septum and anterior and posterior leaflets. Surgical procedure. Currently, cardiac gated CTA is occasionally used to assess ostium secundum ASDs for possible percutaneous septal device closure. Echo is usually the primary method of diagnosis. Promoted articles advertising.