File:EB1911 - Vascular System - Fig. 16.png

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English: Fig. 16.—Electrical Changes of Heart. A, diphasic variation of auricle; R—V, diphasic variation of ventricle. R=base negative; V=apex negative to base. After auricular contraction the ventricular is delayed—an example of arhythmia. (Einthoven.) The string galvanometer is the best method for elucidating disorders of cardiac rhythm.
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Source https://en.wikisource.org/wiki/Page:EB1911_-_Volume_27.djvu/962
Author Encyclopædia Britannica

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Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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