Over the past decade, catheter-based treatments of an increasing variety of structural cardiac diseases have expanded dramatically. These advancements becane available through the design of new devices and the improvement of their performances, as well as increasing the innovation and progress in imaging techniques, and in particular in echocardiography, that allowed for such a surge in available percutaneous procedures. This book was conceived in response to the need to describe the use of the echocardiography and other imaging modalities in percutaneous interventional procedures. In all chapters, the readers will find the anatomy of the structure of interest, a description of the morpho-pathology as seen with different imaging modalities, the criteria for patient selection for the specific percutaneous treatment, and the step-by-step intraprocedural monitoring. The Authors hope that this book will ne a daily reference for echocardiographers, interventionists, anesthesiologists, clinical cardiologists and cardiac surgeons involved in structural heart disease intervention.