To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Video 1 Assessment of atrial septal defects for device closure. Pre-procedural assessment: anatomy of the atrial septum and defects unsuitable for device closure. View Video 1 at http://movie-usa.glencoesoftware.com/video/10.1530/ERP-18-0007/video-1. Echocardiographic approach to catheter closure of atrial septal defects: patient selection, procedural guidance and post-procedural checks Alexandra Savis, and John Simpson 2018. 5:R49-R64 DOI: 10.1530/ERP-18-0007 Download Original Video