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Europace Advance Access originally published online on April 30, 2008
Europace 2008 10(6):681-682; doi:10.1093/europace/eun115
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Published on behalf of the European Society of Cardiology. All rights reserved. © The Author 2008. For permissions please email: journals.permissions@oxfordjournals.org

EHRA EDUCATION COMMITTEE: HOW TO... ARTICLE

QRS alternans and cycle length oscillation during narrow QRS tachycardia

Laurent Roten and Etienne Delacrétaz*

Swiss Cardiovascular Center Bern, University Hospital, CH-3010 Bern, Switzerland

Manuscript submitted 23 January 2008. Accepted after revision 18 March 2008.

* Corresponding author. Tel: +41 31 632 21 11; fax: +41 31 632 42 99. E-mail address: etienne.delacretaz{at}insel.ch


   Case description
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 Case description
 
A 49-year-old man with ventricular pre-excitation (Figure 1) underwent electrophysiological study. A narrow-QRS tachycardia with alternating cycle length and QRS morphology was induced (Figure 2). What is the tachycardia mechanism? What are the different causes of alternating cycle length during supraventricular tachycardia? Is QRS alternans a diagnostic clue?

For answers see page 778


Figure 1
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  		Figure 1. Twelve-lead ECG during sinus rhythm.

 


Figure 2
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  		Figure 2. Twelve-lead ECG of the tachycarclia with oscillating cycle length and alternating QRS morphology.

 
Conflict of interest: none declared.


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F. Tournoux, D. Pavin, A. Solnon, and P. Mabo
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Europace, October 3, 2008; (2008) eun272v1.
[Abstract] [Full Text] [PDF]

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