[The role of transesophageal echocardiography (TEE) in assessment of left ventricular tract obstruction].

Twelve children with subaortic stenosis were analysed. Nine of them developed left ventricular outflow obstruction after surgery for congenital heart disease (VSD + IAA, VSD + DORV, VSD + TGA, VSD + CoA) and then developed an isolated form of primary stenosis. Both echocardiographic exams, TTE and TEE were performed in all patients. TTE was sufficient to assess isolated subaortic stenosis. In children after cardiosurgery, TEE was more reliable and provided more detailed visualisation of the stenosis and its relationship to surrounding structures.