RT Journal Article SR Electronic T1 Need for cardiac catheterisation in assessment of patients for valve surgery. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 268 OP 275 DO 10.1136/hrt.49.3.268 VO 49 IS 3 A1 R J Hall A1 O A Kadushi A1 K Evemy YR 1983 UL http://heart.bmj.com/content/49/3/268.abstract AB