The first volume of The Origins of Ventricular Arrhythmias: Using the ECG as a Key Tool for Localization highlights the value of the 12-lead ECG for the localization of sites of origin or exit sites of ventricular arrhythmias. For this second volume of 30 cases, the author also emphasizes the anatomic relationship of arrhythmia origins by complementing the tracings with cardiac magnetic resonance imaging and real-time echocardiographic data that will help visualize the actual location of ablation target sites. The value of appropriate imaging, in addition to the 12-lead ECG, is highlighted throughout. This book will aid in the understanding of the localizing value of the 12-lead ECG for ventricular arrhythmias, which is key for successfully targeting these arrhythmias using catheter ablation.