1. Complete Heart Block due to Acute Nonspecific Carditis
Ralph Kirmser, M.D., Richard Umbach, M.D., Dale Rowett, M.D., Allan Ross, M.D. 
CHEST 
Volume 71, Issue 5, Pages (May 1977)
DOI: /chest
Copyright © 1977 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Surface lead 2 and His bundle electrogram (HBE) in patient 3. Block is at level of atrioventricular junction (atrio-His [A-H] block). Time lines are at 0.1-second intervals.
CHEST  , DOI: ( /chest )
Copyright © 1977 The American College of Chest Physicians Terms and Conditions