HARRY L. SMITH, M.D., F.A.C.P.; HIRAM E. ESSEX, Ph.D.; EDWARD J. BALDES, Ph.D.
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For years there have been many theories and explanations given for the causes of the heart sounds. There is still considerable variance of opinion, controversy and debate among investigators as to the exact causes of the heart sounds. This is especially true of the first heart sound. It is fairly well agreed among most investigators that the second heart sound is due chiefly to the closure of the semilunar valves. Most of the controversy has been and still is concerned with the cause of the first heart sound. In the past there have been as many as 40 theories proposed
SMITH HL, ESSEX HE, BALDES EJ. A STUDY OF THE MOVEMENTS OF HEART VALVES AND OF HEART SOUNDS12. Ann Intern Med. 1950;33:1357–1359. doi: 10.7326/0003-4819-33-6-1357
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Published: Ann Intern Med. 1950;33(6):1357-1359.
Cardiology, Valvular Heart Disease.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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