A simple, calibrated, ultra-low frequency ballistocardiograph

The physical basis of ballistocardiography has now been thoroughly investigated and there is general agreement that the ultra-low frequency system is the most satisfactory. The physiological basis of ballistocardiography and its clinical application require further study. For this purpose a reliable instrument which can be easily operated and calibrated is needed.The design of such an instrument and its calibrating system, with an analysis of its performance and an indication of the results obtained by its use is presented.SommaireLes bases physique de la ballistocardiographie ont été maintenant étudiées à fond et de l'avis général le système T.B.F. est le plus satisfaisant. Par contre les bases physiologiques de la ballistocardiographie et son application clinique nécessitent des études supplémentaires. Dans ce but il est indispensable de posséder un appareillage sûr qui puisse être utilisé et étalonné avec facilité. On présente la réalisation d'un tel instrument ainsi que son système d'étalonnage en même temps qu'une analyse de ses performances et une indication des résultats obtenus.ZusammenfassungDie physikalische Basis der Ballistokardiographie ist jetzt vollständig erforscht und die allgemeine Übereinstimmung geht dahin, daß das Ultrakurzfrequenz-System das geeignetste ist. Die physiologische Basis der Ballistokardiographie und ihre klinische Anwendung erfordert weitere Untersuchungen. Für diesen Zweck ist ein zuverlässiges Gerät nötig, das leicht bedient und geeicht werden kann. Der Entwurf eines solchen Instrumentes und dessen Eichungssystems, eine Analyse seiner Leistung und die bei seiner Anwendung erzeilten Ergebnisse wird mitgeteilt.

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