Summary
An analysis of blood shifts in an aperiodic ballistocardiogram during the different phases of cardiac contraction showed intervals corresponding precisely to the phases of the discharge of blood from the left ventricle into the aorta. Interval I–II were the phases of rapid discharge, interval III was the phase of delayed discharge during which the pressure wave was distributed along the arterial bed, and period IV was the period of diastole. The use of an aperiodic ballistocardiograph makes it possible to record curves which may be analysed quantitatively and interpreted physiologically.
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Vlasov, Y.A., Gurfinkel', V.S. & Shik, M.L. A model aperiodic ballistocardiograph and a description of an aperiodic ballistocardiogram of a healthy individual. Bull Exp Biol Med 57, 750–753 (1964). https://doi.org/10.1007/BF00784462
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DOI: https://doi.org/10.1007/BF00784462