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The Amplification of Heart Sounds
With the development of physics and improvements in technic in recent years there has been a desire for better methods of analyzing the heart sounds than is possible by ordinary auscultation. In 1923, Dr. Leo Jakobsohn demonstrated before the Berliner Medizinische Gesellschaft some of the early attempts, and experiments undertaken in the meantime were recently reported before the same society. The physicist Dr. F. Trendelenburg discussed "Physiologic Principles and Physiologic Questions Involved in the Examination and Interpretation of Heart Sound Phenomena." On account of the low intensity of heart sound phenomena, not until recently did it become possible, through the use of high-powered electrical receiving apparatus and static-free amplifiers, to examine sound phenomena in a manner wholly satisfactory to the physicist. The experiments carried out in the research laboratory of the Siemenswerke, and also in a number of institutes and clinics, particularly the IV. Med.
BERLIN. JAMA. 1931;97(26):1977–1978. doi:10.1001/jama.1931.02730260043022
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