RT Journal Article SR Electronic T1 The importance of long axis ventricular function JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 577 OP 579 DO 10.1136/heart.84.6.577 VO 84 IS 6 A1 STEPHEN J D BRECKER YR 2000 UL http://heart.bmj.com/content/84/6/577.abstract AB