Heart studies, chiefly clinical. 1, The pulse-sensations : a study in tactile sphygmology / by Wm. Ewart.

  • Ewart, William, 1848-1929.
Date:
1894
Catalogue details

Licence: Public Domain Mark

Credit: Heart studies, chiefly clinical. 1, The pulse-sensations : a study in tactile sphygmology / by Wm. Ewart. Source: Wellcome Collection.

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    tic coat, provided no muscular rigidity should obtain. Hence low tension of pulse gives rise to large oscillations. (4) Low Tension with a Contracted State of the Muscularis —When the bulk of blood circulating through the artery is small, the arterial lumen is re- duced by adaptive contraction of the muscularis, with- out occasioning any rise in pressure. This variety is to be distinguished from the small tense pulse previously described. A large heart-wave is not to be expected under these circumstances; and the oscillations in size of the artery would be further restricted by the contracted state of the muscularis. In extreme re- duction of the volume of the blood, arterial pressure becomes inappreciable. Instances of these very small diameters remaining of subnormal size, even during the pulse-wave, so that neither the artery nor even its pulse are readily perceptible to the touch, are of constant occurrence in the so-called algid state (collapse, etc.). It must not be forgotten that, whenever the arterial wall changes its condition, the other factors never remain unaltered. Both the blood-pressure and the ventricular contraction undergo changes concurrently. THE MEASUREMENT OF ARTERIAL PRESSURE IN MAN BY THE SPHYGMOMETER. * Roy and Ad ami insist that the diversity of the shapes taken by the tracing in the presence of high * The manometric method, represented by von Frey's tonograph, is only applicable where the artery can be exposed and opened. D