5. The Supraventricular Tachycardias
Published Online: 1 NOV 2012
Copyright © 2013 John Wiley & Sons, Ltd.
Bennett's Cardiac Arrhythmias: Practical Notes on Interpretation and Treatment, Eighth Edition
How to Cite
Bennett, D. H. (2012) The Supraventricular Tachycardias, in Bennett's Cardiac Arrhythmias: Practical Notes on Interpretation and Treatment, Eighth Edition, John Wiley & Sons, Ltd, Oxford. doi: 10.1002/9781118432389.ch5
- Published Online: 1 NOV 2012
- Published Print: 14 JAN 2013
Print ISBN: 9780470674932
Online ISBN: 9781118432389
- Accessory pathway;
- Atrial origin vs. atrioventricular re-entry;
- Atrioventricular (AV) junction;
- Dual AV nodal pathways;
- Supraventricular tachycardias
Several tachycardias originate from the atria or atrioventricular (AV) junction and are therefore, by definition, supraventricular in origin: ventricular activation is via the rapidly conducting His–Purkinje system and thus narrow ventricular complexes will usually result. Supraventricular tachycardias are of two main types.
First, there are the AV junctional re-entrant tachycardias. These involve an additional electrical connection between atria and ventricles so an impulse can repeatedly and rapidly circulate between atria and ventricles along a circuit consisting of the AV junction and the additional AV connection. They are usually not associated with any other cardiac pathology.
Secondly, there are the atrial tachyarrhythmias caused by rapid, abnormal activity within the atria, i.e. atrial fibrillation, atrial flutter and atrial tachycardia: the AV node is not an integral part of the tachycardia mechanism but merely transmits some or all of the atrial impulses to the ventricles. They are often associated with other forms of cardiac disease.