This book is written with the intention to present main ECG diagnoses in a very easy, quick and retainable manner. The book consists of two parts, the first deals with basic concepts (Deep Analysis Section; DAS) which makes reader to understand how normal and abnormal ECG and components of ECG including waves, segments and intervals present while second (Quick Diagnosis Section; QDS) part deals with how to diagnose specific in ECG. The other benefit of this sectioning is that after clarification of basic concepts of ECG readers do not need to repeatedly consult the main text while they encounter with ECGs in the wards or during revision for examinations and they can just pay attention to diagnoses.