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6 #  Ritmo cardiaco o Frecuencia cardiaca La frecuencia cardíaca es el número de contracciones del corazón o pulsaciones por unidad de tiempo. Se mide en condiciones bien determinadas (de reposo o de actividad) y se expresa en pulsaciones por minuto a nivel de las arterias periféricas y en latidos por minuto (lat/min) a nivel del corazón. La medición del pulso se puede efectuar en distintos puntos, pero lo más habitual es que se lo mida en la muñeca, en el cuello o en el tórax.  6.1 ## Equipos  1) ###  Electrocardiógrafo 2) Holter  3) Dispositivo electrónico" 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.  1) Electrocardiógrafo: 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