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WILLIAM DOCK, M.D.

Arch Intern Med. 1933;51(5):737-746.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The experimental observations on dogs' heart sounds here described were intended to cast further light on the relative importance of muscular and of valvular elements in the production of the first heart sound. The theory based on these observations seemed to conflict with the views of recent workers, particularly with those of Wolferth and Margolies in their excellent study of the variations of intensity of the first sound in heart block. The relation between auricular systole and the first sound is therefore described in some detail. It is believed that the theory offered gives a coherent explanation of all the phenomena noted in the study of the first heart sound.¹

METHODS

Dogs anesthetized with a brand of chlorbutanol were subjected to midline thoracotomy, and respiration was artificially maintained. The heart sounds were recorded by a collodion Frank capsule from small tambours attached to the ventricular surface by short rigid . . . [Full Text PDF of this Article]

Author Affiliations
SAN FRANCISCO

From the Department of Medicine, Stanford University School of Medicine.

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