content: First of all, I would like to say this book saved me in my Clinical Medicine oral exam; I was asked every possible pattern, and it was in the book! one week before my exam I had the fortune of finding this book in the bookshelf of a bookshop. One good thing about this book is that it is read very quickly (and the cristal-clear language helps!), so it can save someone who needs urgently to get some solid ideas about ECG in the brain! The author simplifies the physics involved too much, so it may be hard to follow the line of thinking in case one doesn`t have strong foundations of cardiac electrophysiology...