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Figure 6: (a) The anatomic section shown to the left hand is a four-chamber cut through the overriding aortic valve in a patient with tetralogy of Fallot. The plane representing the interventricular communication is the upward continuation of the long axis of the ventricular septum (red arrow). It is the right ventricular margin of the cone of space subtended by the overriding valve (green double headed arrow) that is usually considered to represent the ventricular septal defect. The blue double-headed arrow is the effective outflow tract from the left ventricle. (b) A CT angiogram (middle panel) replicates the anatomic section. The plane representing the interventricular communication is the upward continuation of the long axis of the ventricular septum (red arrow). It is the right ventricular margin of the cone of space subtended by the overriding valve (green double headed arrow) that is usually considered to represent the ventricular septal defect. The blue double-headed arrow is the effective outflow tract from the left ventricle. (c) A three dimensional echocardiogram shown to the right hand shows that the plane of the ventricular septum truly divides the overriding aortic root into its right and left ventricular components, this plane being the interventricular communication

Figure 6: (a) The anatomic section shown to the left hand is a four-chamber cut through the overriding aortic valve in a patient with tetralogy of Fallot. The plane representing the interventricular communication is the upward continuation of the long axis of the ventricular septum (red arrow). It is the right ventricular margin of the cone of space subtended by the overriding valve (green double headed arrow) that is usually considered to represent the ventricular septal defect. The blue double-headed arrow is the effective outflow tract from the left ventricle. (b) A CT angiogram (middle panel) replicates the anatomic section. The plane representing the interventricular communication is the upward continuation of the long axis of the ventricular septum (red arrow). It is the right ventricular margin of the cone of space subtended by the overriding valve (green double headed arrow) that is usually considered to represent the ventricular septal defect. The blue double-headed arrow is the effective outflow tract from the left ventricle. (c) A three dimensional echocardiogram shown to the right hand shows that the plane of the ventricular septum truly divides the overriding aortic root into its right and left ventricular components, this plane being the interventricular communication