This volume features 30 cases, presented as a series of "unknowns" to teach electrophysiology and cardiology fellows-in-training the concept of connecting ventricular arrhythmias' QRS morphology with the arrhythmia site of origin. These case studies are complemented by multimodality imaging and anatomy data to illustrate the precise locations of the sites of origin of different ventricular arrhythmias. Mapping approaches are discussed to...