RT Journal Article SR Electronic T1 Free-floating left atrial thrombus formed in a few weeks in a patient with a normal mitral prosthesis JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 246 OP 246 DO 10.1136/hrt.2006.091306 VO 93 IS 2 A1 Popescu, B A A1 Radulescu, B A1 Ginghina, C YR 2007 UL http://heart.bmj.com/content/93/2/246.abstract AB