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Willem Einthoven (1860–1927), known as the creator of the electrocardiograph, won a Nobel Prize in 1924 for his contributions to the field of electrocardiography. He was dedicated to research and learning. The ECG is not only the oldest but, in fact, 100 years after its introduction, continues as the most commonly used cardiovascular laboratory procedure. It is noninvasive, simple to record, highly reproducible and can be applied serially. The equipment and the cost of recording are minimal.  2) ###  Holter 3) ###  Dispositivo electrónico