Subaortic Stenosis
A Case of Subaortic Membrane
Background
Subvalvular aortic stenosis (SAS) is a rare cardiac pathology that is often discovered in the pediatric setting incidentally. In most cases, this is caused by a muscular membrane that obstructs flow exiting the left ventricular outflow tract (LVOT). Subaortic stenosis accounts for about 15-20% of all LVOT obstructive lesions and can reoccur during adulthood (Alamoudi et al, 2022)
This echocardiographic finding can coexist with a bicuspid aortic valve, ventricular septal defect, atrial septal defect, patent ductus arteriosus, or coarctation of the aorta. The extent of the lesion and progression of outflow tract gradients are monitored with echocardiography as displayed in the 2D and 3D examples in this article.