RT Journal Article SR Electronic T1 Main stem subocclusion shortly after aortic valve replacement JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 530 OP 531 DO 10.1136/hrt.80.5.530 VO 80 IS 5 A1 G Van Langenhove A1 P Van den Heuvel A1 F Van den Branden YR 1998 UL http://heart.bmj.com/content/80/5/530.abstract AB