To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Video 3 Apical 4-chamber view showing intra-left ventricular bubbles; a normal finding. View Video 3 at http://movie-usa.glencoesoftware.com/video/10.1530/ERP-16-0032/video-3. The echocardiography of replacement heart valves John B Chambers 2016. 3:R35-R43 DOI: 10.1530/ERP-16-0032 Download Original Video