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Two Einthoven galvanometers coupled in tandem were used to record the electrocardiogram and the heart sounds simultaneously, and the electrical stethoscope manufactured by the Western Electric Company was used to convert the sounds into electrical variations. The study of a large number of phonocardiograms led to the following tentative conclusions: From the graphic standpoint gallop rhythm may be defined as a condition in which three sounds occur during each cardiac cycle. Several varieties may be distinguished, (a) Protodiastolic gallop rhythm in which the extra sound follows the second heart sound by a constant interval and occupies the same position in
Observations on Heart Sounds with Particular Reference to Gallop Rhythm and Sounds of Auricular Origin.. Ann Intern Med. 1932;6:296. doi: https://doi.org/10.7326/0003-4819-6-2-296_1
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Published: Ann Intern Med. 1932;6(2):296.
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