M. A. MORTENSEN, M.D., F.A.C.P.
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The purpose of this communication is to emphasize the practical value of the electrocardiogram for the study of cardiovascular diseases. The tracing is based on the electrical reactions of the heart muscle during each complete cycle of action and rest. The evolution of our knowledge of the cardiogram dates back to Matteuci, who in 1843 reported the existence of reactions or currents originating in the heart muscle. The studies of Engelman, Marey, Burdon, Sanderson and Page, Gaskell, Kölliker and Mueller, and Waller, led up to the development of the string galvanometer by Einthoven in 1903. Since then there has been
MORTENSEN MA. A Study of 800 Abnormal Electrocardiograms and Associated Clinical Conditions*. Ann Intern Med. 1933;6:1308–1314. doi: https://doi.org/10.7326/0003-4819-6-10-1308
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Published: Ann Intern Med. 1933;6(10):1308-1314.
Cardiac Diagnosis and Imaging, Cardiology.
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