Book excerpt: An ECG, or electrocardiogram, is a simple test that records the rhythm and electrical activity of the heart. It is commonly used to detect abnormal heart rhythms and investigate the cause of chest pains. It is important for clinicians to recognise and interpret ECG patterns accurately to ensure correct diagnosis and effective treatment. This atlas is a quick reference tool presenting numerous normal and abnormal ECG patterns and schematic diagrams. Each case is accompanied by a brief commentary discussing the abnormality. The book is divided into two sections – Deep Analysis Section and Quick Diagnosis Section, giving trainees a strong foundation of the concept of ECG, and then an understanding of the diagnosis of a wide range of cardiac abnormalities. Key points Quick reference presenting normal and abnormal ECG patterns Brief commentary helps explain each case Includes self assessment section Nearly 300 ECG graphs, schematic diagrams and illustrations