Typical Atrioventricular Bypass Tracts
Abstract Bypass tracts (BTs) are remnants of the atrioventricular (AV) concaused by incomplete embryological development of the AV annuli and failure of the fibrous separation between the atria and ventricles….
Ventricular Tachycardia in Arrhythmogenic Right Ventricular Cardiomyopathy
Abstract Arrhythmogenic right ventricular cardiomyopathy (ARVC), also referred to as “arrhythmogenic cardiomyopathy,” is an inherited desmosomal cardiomyopathy with incomplete penetrance and variable expressivity. ARVC is characterized by ventricular arrhythmias and…
Arrhythmias in Hypertrophic Cardiomyopathy
Abstract Hypertrophic cardiomyopathy (HCM) is characterized by a thickened but nondilated left ventricle in the absence of any other cardiac or systemic condition capable of producing the magnitude of hypertrophy…
Epicardial Ventricular Tachycardia
Abstract Ventricular tachycardia (VT) originating from the subepicardium is an important cause of failure of endocardial approaches to VT ablation. Mapping arrhythmia foci or circuits that are deep within the…
Ventricular Arrhythmias in Adults With Congenital Heart Disease
Abstract In general, patients with congenital heart disease (CHD) are prone to two forms of ventricular tachyarrhythmias: (1) macroreentrant monomorphic ventricular tachycardia (VT) related to scar or prosthetic materials used…
Ventricular Tachycardia in Nonischemic Dilated Cardiomyopathy
Abstract Dilated cardiomyopathy (DCM) is the most common type of cardiomyopathy and is often viewed as a “final common pathway” of numerous types of cardiac injuries. The diagnosis of nonischemic…
Ventricular Arrhythmias in Ischemic Heart Disease
Abstract Coronary heart disease is the most common cause of clinically documented ventricular tachycardia (VT). The majority of sustained monomorphic VTs in patients with prior myocardial infarction (MI) are caused…
Fascicular Ventricular Tachycardia
Abstract Idiopathic fascicular ventricular tachycardia (VT) is a reentrant tachycardia involving the left fascicular Purkinje system. The reentry circuit is most commonly (90%) located in the territory of the left…
Focal Atrial Tachycardia
Abstract Focal atrial tachycardia (AT) is characterized by atrial activation starting at a small area (focus), from which it spreads out centrifugally. “Focal” implies that the site of origin cannot…
Atrioventricular Nodal Reentrant Tachycardia
Abstract Atrioventricular nodal reentrant tachycardia (AVNRT) is the most common form of paroxysmal supraventricular tachycardia. The exact electroanatomic circuit responsible for AVNRT remains elusive. Current evidence suggests that dual atrioventricular…
