Science & tech · 2006
How did a frog experiment help reveal the heart's electrical activity?
Matteucci's rheoscopic frog in Pisa provided the first evidence of the heart's electrical activity in 1844. His findings were confirmed and expanded 12 years later at Würzburg.
Details
This historical account traces early evidence and instruments for detecting the heart's electrical activity. The first evidence was found in 1844 in Matteucci's rheoscopic frog in Pisa. His results were confirmed and expanded 12 years later at Würzburg.
The capillary electrometer produced a continuous record that could be photographed. Einthoven initially used this instrument, but its record required onerous mathematical conversion. To avoid that conversion, he developed the string galvanometer by the close of the century and demonstrated its clinical value in 1906.
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