Exercise-induced second-degree atrioventricular block

In this report we describe the case of a 56-year-old woman with normal 1 : 1 AV conduction at rest who developed 2 : 1 AV block during treadmill exercise testing. Electrophysiological study documented 2 : 1 AV block proximal to the His bundle with reappearance of 1 : 1 AV conduction at a higher paci...

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Bibliographic Details
Published in:International journal of cardiology 2006-08, Vol.111 (3), p.461-463
Main Authors: Pappas, Loukas K., Efremidis, Michalis, Sideris, Antonios, Letsas, Konstantinos P., Kounas, Stavros P., Kardaras, Fotios
Format: Article
Language:English
Subjects:
Atrioventricular block
Bundle of His
Electrocardiography
Electrophysiologic Techniques, Cardiac
Electrophysiological study
Exercise test
Exercise Test - adverse effects
Female
Gap phenomenon
Heart Block - etiology
Humans
Middle Aged
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Summary:In this report we describe the case of a 56-year-old woman with normal 1 : 1 AV conduction at rest who developed 2 : 1 AV block during treadmill exercise testing. Electrophysiological study documented 2 : 1 AV block proximal to the His bundle with reappearance of 1 : 1 AV conduction at a higher pacing atrial rate. A gap phenomenon involving a proximal and distal part of the AV node may be a likely explanation of paradoxical AV conduction in our case.
ISSN:0167-5273
1874-1754
DOI:10.1016/j.ijcard.2005.06.060