Abstract
The precordial low-frequency vibrations have long been recognized to hold valuable informations on various cardiac diseases, and many attempts to record the vibrations have been made by a variety of techniques. Nevertheless, there are as yet many controversies among the results obtained by different investigators.
The purpose of this paper is to establish a standardized recording procedure to obtain the Kinetocardiogram (KCG). Using the photoelectric transducer and studying the averaged tracing by analog computer, the author obtained the curve of precordial movements as KCG without any distortions. The following results were obtained : (1) the photoelectric method gave a precise recording of KCG, (2) the transducer should not be fixed onto the surface of the subject, (3) the recording positions proposed by Eddlemann were preferable for the clinical purpose, and (4) a new system of nomenclature of the deflections was proposed.
