RT Journal Article SR Electronic T1 Progressive ECG changes before the onset of atrial flutter in adult congenital heart disease patients JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 703 OP 703 DO 10.1136/heart.85.6.703 VO 85 IS 6 A1 WEI LI A1 HAN B XIAO A1 MICHAEL Y HENEIN A1 JANE SOMERVILLE A1 DEREK G GIBSON YR 2001 UL http://heart.bmj.com/content/85/6/703.1.abstract AB