Sinoatrial reentry tachycardia: a review

Simmers, TA and Sreeram, N (2003) Sinoatrial reentry tachycardia: a review. Indian Pacing and Electrophysiology Journal, 3 (3). pp. 109-116. ISSN 0972-6292

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The concept of reentry within the sinus node is by no means new. In their 1943 report, Barker and co-workers postulated that “…a circus rhythm could be accommodated in auricular muscle and in one of the specialized nodes at known rates of conduction and with cycle lengths such as occur in paroxysmal tachycardia” 1. Lack of invasive electrophysiology at that time and subsequent failure to appreciate the heterogeneity of supraventricular arrhythmias, left their astute observation in the realm of conjecture. It was not until 1968 that Han, Malozzi and Moe finally demonstrated the existence of sinoatrial echoes 2. In a superfused isolated rabbit right atrial preparation, they examined the response to premature extrastimuli with an 18 electrode grid at the sinus node and surrounding atrial tissue. They found that critically timed extrastimuli led to early re-excitation of the atrium, supposedly due to sinoatrial reentry. Sequential microelectrode measurements of sinus node and atrial transmembrane potentials were performed in an attempt to provide a temporal and anatomical map of the observed phenomenon. Based on findings, the authors concluded that sinoatrial reciprocation was caused by entrance block at one site, slow conduction within the node with disparate refractoriness, and re-excitation of the atrium at the original area of entrance block. They went on to suggest that repetition of this phenomenon may conceivably form the basis for clinically relevant tachycardia. In vivo confirmation of sinoatrial echoes was inferred from work by Childers 3 and Paulay

EPrint Type:Article
Uncontrolled Keywords:Sinoatrial Reentry Tachycardia, Sinus Node, Atrium
Subjects:-Journal Repositories > Indian Pacing and Electrophysiology Journal
Cardiovascular Diseases > Heart Diseases > Arrhythmia > Tachycardia
Cardiovascular System > Heart
Cardiovascular System > Heart > Heart Conduction System
ID Code:256
Deposited By:Indian Pacing and Electrophysiology Journal
Deposited On:11 July 2005

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