Open AccessAtrioventricular Block Precipitated by Isoproterenol
Author(s) -
Barold S. Serge,
De Wilde Hans E.,
Timmers Liesbeth,
Van Heuverswyn Frederic E.,
Stroobandt Roland X.
Publication year - 2015
Publication title -
annals of noninvasive electrocardiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.494
H-Index - 48
eISSN - 1542-474X
pISSN - 1082-720X
DOI - 10.1111/anec.12192
Subject(s) - medicine , atrioventricular block , cardiology , bundle branch block , right bundle branch block , left bundle branch block , anesthesia , block (permutation group theory) , syncope (phonology) , electrocardiography , heart failure , geometry , mathematics
An isoproterenol infusion was administered during an electrophysiologic study (EPS) in a patient with a history of near syncope, left bundle branch block, and no documented atrioventricular (AV) block. Isoproterenol precipitated classic 2:1 Infra‐Hisian AV block most probably proximal to the site of recording a His–Purkinje potential consistent with right bundle branch activity. Paroxysmal AV block also occurred during isoproterenol washout at a different site located distal to the presumed right bundle branch potential. Isoproterenol may be valuable diagnostically in an occasional patient suspected of AV block in whom an EPS is unrevealing and a drug challenge is negative.