RT Journal Article SR Electronic T1 Swinging heart and vector alternans: signs of impending doom JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1545 OP 1545 DO 10.1136/heartjnl-2013-304058 VO 99 IS 20 A1 Chhabra, Lovely A1 Spodick, David H YR 2013 UL http://heart.bmj.com/content/99/20/1545.abstract AB