RT Journal Article SR Electronic T1 Prolonged sinus arrest after coronary artery spasm JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 558 OP 558 DO 10.1136/heart.89.5.558 VO 89 IS 5 A1 J-W Ha A1 S-Y Cho YR 2003 UL http://heart.bmj.com/content/89/5/558.abstract AB