RT Journal Article SR Electronic T1 If directional coronary atherectomy is useful then why is it not used more often? JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 33 OP 34 DO 10.1136/hrt.78.Suppl_2.33 VO 78 IS Suppl 2 A1 Mazhar Khan YR 1997 UL http://heart.bmj.com/content/78/Suppl_2/33.abstract AB