Electrocardiograph (Ecg) - Research Article from World of Invention

This encyclopedia article consists of approximately 2 pages of information about Electrocardiograph (Ecg).

Electrocardiograph (Ecg) - Research Article from World of Invention

This encyclopedia article consists of approximately 2 pages of information about Electrocardiograph (Ecg).
This section contains 431 words
(approx. 2 pages at 300 words per page)
Buy the Electrocardiograph (Ecg) Encyclopedia Article

In the late 1700s medical researchers learned that muscles produce tiny electric impulses now known as "action potentials." Italian biophysicist, Carlo Matteucci (1811-1868), identified action potentials in a pigeon's heart in 1843 and, in 1856, German scientists Rudolf Albert von Kölliker (1817-1905) and Heinrich Müller (1820-1864) recorded these electric currents from a frog's heart. Reasoning that these recordings could reveal irregularities and, hence, heart disease, researchers attempted to develop accurate measuring devices. The French physiologist, Augustus Waller (1856-1922), found that cardiac currents could be recorded by placing surface electrodes on the body. In 1887, Waller developed a capillary electrometer--tubes of mercury that rose and fell with the changes in heart muscle current--which, however, was imprecise and difficult to use. So Dutch physiologist Willem Einthoven set out to design an improved apparatus. In 1903 he described the result, his string galvanometer consisting of a thin, silver-coated quartz...

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This section contains 431 words
(approx. 2 pages at 300 words per page)
Buy the Electrocardiograph (Ecg) Encyclopedia Article
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