Conflict of interest: none.
Wide Complex Tachycardia in the Presence of Class I Antiarrhythmic Agents: A Diagnostic Challenge
Article first published online: 24 SEP 2013
©2013 Wiley Periodicals, Inc.
Annals of Noninvasive Electrocardiology
How to Cite
Bhardwaj, B., Lazzara, R. and Stavrakis, S. (2013), Wide Complex Tachycardia in the Presence of Class I Antiarrhythmic Agents: A Diagnostic Challenge. Annals of Noninvasive Electrocardiology. doi: 10.1111/anec.12099
- Article first published online: 24 SEP 2013
- wide complex tachycardia;
- antiarrhythmic agents;
- atrial flutter
We present two patients with paroxysmal atrial fibrillation on class 1C antiarrhythmic drugs without concomitant atrioventricular (AV) nodal blocking agents who developed atrial flutter with 1:1 AV conduction. Their electrocardiogram revealed wide complex tachycardia with rates >200/minute. Atrial flutter with 1:1 conduction in the presence of class IC antiarrhythmic drugs may present a diagnostic challenge. These cases illustrate the importance of coadministering an AV nodal blocking agent with class IC antiarrhythmic agents in patients with atrial fibrillation. The differential diagnosis of wide complex tachycardia in patients taking class IC agents should include atrial flutter with 1:1 AV conduction.