1943•The journal of the Institution of Electrical Engineers. Part 3, Communication engineeringRequires access
The electrical amplifying stethoscope and phono-electrocardioscope
G. E. Donovan
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Abstract
The important factors are discussed. A new method is described for the direct visual observation of the phonocardiogram accompanied by a simultaneous electrocardiogram, or phonocardiogram plus sphygmogram, etc., at the patient's bedside. The heart sounds can be heard at the same time through a special electrical stethoscope which is incorporated in the apparatus.