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Electrocardiogram (ECG), the Nobel Prize-winning discovery by Willem Einthoven, revolutionized the field of medicine by providing a non-invasive method to measure and record the heart's electrical activity. This innovation marked a significant milestone in cardiology, allowing for the early detection and diagnosis of various heart conditions. Through ECG, Einthoven's groundbreaking discovery has had a profound impact on patient care and management, transforming the diagnosis and treatment of cardiovascular diseases.