To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Video 1 Apical four-chamber view, demonstrating incomplete leaflet coaptation between the anterior mitral valve leaflet (AMVL) and posterior mitral valve leaflet (PMVL). L, lateral wall; LA, left atrium; LV, left ventricle; S, septum. View Video 1 at http://movie-usa.glencoesoftware.com/video/10.1530/ERP-19-0007/video-1. Severe mitral regurgitation due to atrial tachyarrhythmia: cure by DC cardioversion Jack Parnell, Mehak Tahir, and Benoy N Shah 2019. 6:I1-I2 DOI: 10.1530/ERP-19-0007 Download Original Video