This 12th edition of Marriott's Practical Electrocardiography offers residents and fellows the resources they need to quickly build up their ECG interpretive skills. Completely updated and revised to reflect the latest advances in ECG technology as well as the newest diagnostic applications this edition also features a fully searchable website that includes animations and video clips illustrating cardiovascular disease processes and key correlations between ECG results and the heart muscle. Smartphone users will appreciate the QR codes that are placed throughout the text to instantly take the reader to the relevant electronic content. Residents and fellows will have all the resources they need to quickly build their ECG interpretive skills.