RT Journal Article SR Electronic T1 Heartbeat: pacer risk in patients with right bundle branch block JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1131 OP 1133 DO 10.1136/heartjnl-2019-315623 VO 105 IS 15 A1 Catherine M Otto YR 2019 UL http://heart.bmj.com/content/105/15/1131.abstract AB