Catheter-based closure is preferable in patients with secundum ASD and suitable anatomy. Favorable anatomy includes: at least 5-mm rims of tissue on transesophageal echocardiography, no associated ...

is the most common and simple type of ASD. Echocardiography (less frequently transesophageal echocardiography) is the first-line diagnostic test. 3D echocardiography and MRI are the most promising ...