Sinus Node and Atrio-ventricular Junction Modification/Ablation Introduction Inappropriate sinus tachycardia (IAST) is an uncommon entity that can cause debilitating symptoms and even a tachycardia-mediated cardiomyopathy.1,2,3 Generally, it is a diagnosis…
Atrial Tachycardia Introduction Atrial tachycardia (AT) can be categorized into two general types: focal and macroreentrant. Focal ATs arise from a “point source” with centrifugal spread to the rest of…
Ablation of Accessory Pathways Introduction Catheter ablation is a highly effective treatment for accessory pathways (APs) that are high risk or cause symptoms. The purpose of this chapter is to:…
Unusual Types of Accessory Pathways Introduction Typical accessory pathways (APs) (bundle of Kent) are nondecremental muscle fibers spanning the tricuspid or mitral annulus. In contrast to single APs, multiple APs…
Orthodromic Reciprocating Tachycardia Introduction Orthodromic reciprocating tachycardia (ORT) is the second most common paroxysmal supraventricular tachycardia (SVT) and the prototypical accessory pathway (AP)-mediated tachycardia. The purpose of this chapter is…
Atrio-ventricular Nodal Reentrant Tachycardia Introduction Atrio-ventricular nodal reentrant tachycardia (AVNRT) is the most common paroxysmal supraventricular tachycardia (SVT). The purpose of this chapter is to: Discuss dual atrio-ventricular (AV) node…
Basic Evaluation of Accessory Pathways Introduction The typical accessory pathway (AP) (bundle of Kent) is a muscle fiber bridging the atrio-ventricular (AV) groove and providing electrical continuity between the atrium…
Long RP Tachycardias Introduction Long RP tachycardias are an unusual type of narrow complex tachycardia (NCT) that includes atrial tachycardia (AT) and four atrio-ventricular (AV) node-dependent tachycardias: 1) pure atypical…
Ablation of Atrio-ventricular Nodal Reentrant Tachycardia Introduction Catheter ablation is a highly effective treatment for atrio-ventricular nodal reentrant tachycardia (AVNRT). While ablation of the fast pathway (FP) was initially performed,…
Narrow Complex Tachycardias Introduction The three major causes of a paroxysmal supraventricular tachycardia (SVT) are 1) atrio-ventricular nodal reentrant tachycardia (AVNRT ˜80%), 2) orthodromic reciprocating tachycardia (ORT ˜15%), and 3)…
