RT Journal Article SR Electronic T1 A study in intracardiac conduction. 'Normalization' of bundle-branch block by fusion with ventricular escape beats. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 213 OP 216 DO 10.1136/hrt.34.2.213 VO 34 IS 2 A1 B Witcombe A1 L Schamroth YR 1972 UL http://heart.bmj.com/content/34/2/213.abstract AB