This book is a compilation of articles that appeared in the journal Tempo Médical, responsible editor Medisquare SA (formerly MediPress Services) during the decade 2000-2010. Each article presents an exemplary, clinically well-documented electrocardiogram case and is discussed in the section "ECG of the month of the Belgian Cardiological League". The names of the authors are given at the bottom of the first page of each article. This collection, which offers a panorama of knowledge in the field of clinical electrocardiography, should be of interest to all those who, in their professional activities, use the ECG as a diagnostic tool.