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  2. Willem Einthoven - Wikipedia

    en.wikipedia.org/wiki/Willem_Einthoven

    Before Einthoven's time, it was known that the beating of the heart produced electrical currents, but the instruments of the time could not accurately measure this phenomenon without placing electrodes directly on the heart. Beginning in 1901, Einthoven completed a series of prototypes of a string galvanometer.

  3. String galvanometer - Wikipedia

    en.wikipedia.org/wiki/String_galvanometer

    [4] Einthoven developed a sensitive form of string galvanomter that allowed photographic recording of the impulses associated with the heartbeat. He was a leader in applying the string galvanometer to physiology and medicine, leading to today's electrocardiography. [5] Einthoven was awarded the 1924 Nobel prize in Physiology or Medicine for his ...

  4. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    ECGs are normally printed on a grid. The horizontal axis represents time and the vertical axis represents voltage. The standard values on this grid are shown in the adjacent image at 25mm/sec: [55] A small box is 1 mm × 1 mm and represents 0.1 mV × 0.04 seconds. A large box is 5 mm × 5 mm and represents 0.5 mV × 0.20 seconds.

  5. Alexander Filippovich Samoylov - Wikipedia

    en.wikipedia.org/wiki/Alexander_Filippovich_Samoylov

    In 1904 he met Willem Einthoven at the International Physiological Congress in Brussels and then began to make use of a string galvanometer. He published on ECGs and vagus nerve stimulation experiments on frogs in 1908. [1] [2] He began to examine cardiac arrhythmias and their diagnosis. From 1903 to 1930 he worked at the department of zoology ...

  6. Horatio Burt Williams - Wikipedia

    en.wikipedia.org/wiki/Horatio_Burt_Williams

    Williams traveled to Holland to study the methods of Willem Einthoven in 1911. [ 2 ] He constructed the first string galvanometer in America, pioneered vectorcardiography , discovered the ventricular vulnerable period, and first determined the 60-Hz current required to produce ventricular fibrillation with body-surface electrodes.

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  9. Bioamplifier - Wikipedia

    en.wikipedia.org/wiki/Bioamplifier

    The electrocardiograph was impractical to use until Willem Einthoven, a Dutch physiologist, innovated the use of the string galvanometer for cardiac signal amplification. [2] Significant improvements in amplifier technologies led to the usage of smaller electrodes that were more easily attached to body parts. [ 1 ]

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