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- W2000858171 abstract "1. A method is described which allows the study of the transmission of sound from the surface of the body to the interior of the different heart cavities and vessels in animals and human beings. 2. During cardiac standstill, as well as post mortem, there is a conductivity of sound waves from the chest wall to the interior of the heart and vessels (within the tested frequency range of 50 to 1,000 c.p.s.) which depends on the location of the sound receptor and generator and on the frequency of the test vibration. 3. Cardiac action modifies the conduction of sound through the walls of the different heart chambers in a characteristic manner. A sound wave of constant amplitude applied to the thoracic surface will be modulated in amplitude by heart action when it passes the heart walls. The tracing of the test vibration modulated in amplitude is called the diacardiac phonogram. The shape of the diacardiac phonogram depends mainly on the heart cavity from which it is picked up. It is affected only to a lesser degree by the location of the extracardiac sound generator, the frequency of the test vibration, and the respiration. An increase in the distance of the sound generator from the receptor does not alter the shape of the diacardiac phonogram significantly but diminishes its mean amplitude." @default.
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- W2000858171 date "1963-01-01" @default.
- W2000858171 modified "2023-10-14" @default.
- W2000858171 title "The diacardiac phonogram" @default.
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- W2000858171 doi "https://doi.org/10.1016/0002-8703(63)90214-x" @default.
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