The fifth edition of Mayo Clinic Cardiology: Concise Textbook follows from other previous editions providing a comprehensive overview of the field of cardiology. This textbook is designed for physicians-in-training, be they budding cardiologists, internists, or related disciplines. It caters particularly to those preparing for qualifying boards and examinations who want a manageable amount of high-value information about the heart in an easily digestible format. This revised edition is updated to reflect current practice guidelines and includes key information that all cardiologists should know is presented in a brief and interesting manner. This textbook is not, nor is it intended to be, a definitive or exhaustive guide to cardiology.