The Morphology of the Pulse Curve of the Aorta.1

Autor: Arne P. Skouby
Rok vydání: 1945
Předmět:
Zdroj: Acta Physiologica Scandinavica. 10:374-380
ISSN: 1365-201X
0001-6772
DOI: 10.1111/j.1748-1716.1945.tb00322.x
Popis: Summary. In order to examine the secondary oscillations in more natural circumstances than done before, I have by means of a condenser manometer recorded pressure curves from the root of the aorta of dogs during narcosis and without any narcosis in varying circumstances. The distances between the maxima and minima of the oscillations are measured and the following results found: 1) Apart from the intervals b1c, ed and de (Fig. 1) all distances measured in the single experiment are practically uniform. 2) In different animals and in the same animal in varying conditions the distances between maxima, though constant in the single determination, may have different values. 3) The pressure curves at the moment of inflow of blood into the aorta shows differences corresponding to the phase variation of the preoscillations. 4) The initial oscillations are pronounced when the systolic curve continues as a plateau after the steep rise. 5) The initial and after-oscillations have the character of damped oscillations with gradually decreasing amplitude. The results are discussed and indicate, that the pre-oscillations in opposition to FRANK'S theory are oscillations proper of the same system to which initial and after-oscillations belong. As the preoscillations begin before the expulsion period it is supposed, that the pull of the heart on the aorta during the isometric phase of contraction initiates the oscillations. An explanation of the differences between curves obtained during narcosis or rest and curves from working dogs or dogs during amylnitrite inhalation is forwarded. The author wishes to thank F. BUCHTHAL, M. D. for advice and encouragement in the course of this investigation.
Databáze: OpenAIRE
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