This book elucidates a number of new concepts on P-wave evaluation and QRS depolarization properties, and reports on several repolarization findings never covered in previous ECG books. The content is primarily based on case reports, some of which are compared in order to reveal their ostensibly small but significant differences. The book addresses a significant and lingering gap in ECG interpretation, which is the actual cause of many poor decisions in the diagnostic and therapeutic contexts. Further, the book has an interdisciplinary appeal, and will be of equal interest to professionals and scholars with an interest in cardiology and ECG interpretation.