Preexcited Tachycardias Introduction Preexcited tachycardias refer collectively to tachycardias associated with antegrade conduction over an accessory pathway (AP). The AP can either 1) be a passive bystander serving a subsidiary…
Atrial Fibrillation Introduction Atrial fibrillation is the most common arrhythmia and causes rapid, chaotic, and uncoordinated contraction of the atria. It can be classified by presentation as 1) paroxysmal (≥2…
Bundle Branch Reentrant Tachycardia Introduction Bundle branch reentrant tachycardia (BBRT) (“bundle to bundle” tachycardia) is a macroreentrant ventricular tachycardia (VT) that utilizes both right bundle (RB) and left bundle (LB)…
Atrial Flutter Introduction Atrial flutter is a macroreentrant atrial tachycardia that can be categorized by the location of its reentrant circuit and the protected isthmus of slow conduction. The most…
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…
