What question did this study set out to answer?

To determine the relative importance of muscular versus valvular elements in generating the first heart sound and explain variations in sound intensity during heart block.

May 1, 1933Archives of Internal Medicine

Mode of Production of the First Heart Sound

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Authors

WDWilliam DockTufts University

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Implication

Experimental study demonstrates the acoustic role of auricular systole and valve mechanics in canine models, clarifying first heart sound generation in heart block.

Key Points

To determine the relative importance of muscular versus valvular elements in generating the first heart sound and explain variations in sound intensity during heart block.
Canine models anesthetized with chlorbutanol underwent midline thoracotomy with artificially maintained respiration.
Heart sounds were directly recorded from small tambours attached to the ventricular surface using a collodion Frank capsule.
Experimental recordings demonstrate a close relationship between auricular systole and the timing and intensity of the first heart sound.
The physiological model provides a coherent mechanism that explains sound variations observed during atrioventricular heart block without solely attributing them to valvular closure.

Cite This Study

William Dock (1933) studied this question.

synapsesocial.com/papers/6a89cda4f8670bac6e335b98 https://doi.org/10.1001/archinte.1933.00150240096007

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Implication

Experimental study demonstrates the acoustic role of auricular systole and valve mechanics in canine models, clarifying first heart sound generation in heart block.

Mode of Production of the First Heart Sound

Discussion

Member takes

Implication

Key Points

Cite This Study

Mode of Production of the First Heart Sound

Discussion

Member takes

Implication

Key Points

Cite This Study

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