Unusual Electrophysiologic Phenomena Introduction Electrophysiology has many peculiar arrhythmias and patterns of conduction. One of them is the unexpected conduction of a premature impulse. This is manifested as either the…
Idiopathic Ventricular Tachycardia and Fibrillation Introduction Idiopathic ventricular tachycardia (VT) and ventricular fibrillation (VF) can occur in the absence of structural heart disease. Two anatomic sites showing a predilection for…
Wide Complex Tachycardias Introduction The major differential diagnoses of a regular wide complex tachycardia (WCT) are 1) ventricular tachycardia (VT), 2) supraventricular tachycardia (SVT) with aberration or bundle branch block…
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:…
