RT Journal Article SR Electronic T1 Persistent left sided and absent right sided superior vena cava complicating permanent pacemaker insertion. JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 413 OP 413 DO 10.1136/hrt.75.4.413 VO 75 IS 4 A1 R. A. Rusk A1 R. S. Bexton A1 J. M. McComb YR 1996 UL http://heart.bmj.com/content/75/4/413.abstract AB