Abstract
In the early days of cardiac auscultation, there were numerous theories of the origin of the heart sounds, but in 1832 Rouanet published his observations [1] made by pumping water through a heart manually, while holding it to his ear to listen to the noises generated. He noted that two major sounds were generated in each ventricle, one at the beginning and one at the end of systole, and attributed them to “tensing of the valve leaflets”, a hypothesis which became generally accepted and has proved satisfactory for clinical purposes ever since. Thus, the first heart sound (SI) is associated with closure of the atrioventricular valves and the second sound (S2) with closure of the semilunar valves. The two narrowly separated components of SI and S2 often detected on auscultation can be explained by the slight delay in right-sided events [2], so that SI is compounded of sounds associated with mitral closure (Ml), closely followed by tricuspid closure (Tl), and S2 similarly contains aortic (A2) and pulmonary (P2) components.
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References
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© 1980 Springer-Verlag Berlin Heidelberg
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Leech, G.J., Leatham, A. (1980). Correlation of Heart Sounds and Valve Motions. In: Bleifeld, W., Effert, S., Hanrath, P., Mathey, D.G. (eds) Evaluation of Cardiac Function by Echocardiography. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67626-0_13
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DOI: https://doi.org/10.1007/978-3-642-67626-0_13
Publisher Name: Springer, Berlin, Heidelberg
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