Objective: Real-time three-dimensional echocardiography, using both reconstruction methods and RT3D, has been used as an extra helping tool in several forms of congenital heart diseases. Our aim was to understand the relation of the ASD device to all surrounding structures by 3-dimensional echocardiography (3D).
Methods: This prospective study included 37 patients diagnosed as ASD secundum by transthoracic (TTE) and transesophageal echocardiography (TEE) referred for transcatheter closure from October 2013 to July 2016. Follow-up for 1 year using 2D and 3D-echocardiography was performed to assess the relations of the device to the surrounding structures.
Results: Transcatheter ASD closure and echocardiographic examinations were successfully performed for all patients. By 3D echocardiography, 16 patients (43.24%) had their ASD device close to the aortico-mitral continuity plane without apparent regurgitation, while the rest of our patients (56.75%) the devices were away from this plane. The following variables were significantly different between the two groups; body surface area, atrioventricular rim (AV), device size, left disc size and ratio of left disc to interatrial septum. A cut-off AV rim length not less than 8 mm was found optimal to avoid device encroachment on the sensitive surrounding structures. New Formula was constructed to aid in device choice.
Conclusion: Use of 3D before and after ASD closure is of value to determine the device relation to the surrounding structures. AV rim by TEE is an important rim to avoid eventual encroachment on the mitral valve and aorta.
Keywords: 3-Dimensional echocardiography; Atrioventricular rim; Mitral regurgitation.