Therapeutics of the circulation / by Sir Lauder Brunton.

  • Lauder Brunton
Date:
1914
Catalogue details

Licence: Public Domain Mark

Credit: Therapeutics of the circulation / by Sir Lauder Brunton. Source: Wellcome Collection.

    145/568 page 117
    contracted, the flow is slow and the oscillation small (Fig. 33). These points may be made clearer by using as an example some curves of blood-pressure which A. B. Meyer and I took in 1867 in du Bois-Reymond’s laboratory in Berlin (Fig. 33).36 The first section of the diagram shows the normal pressure, the second the pressure after digitalis had begun to exert its action, and the third Fig. S3.—Tracing of the blood-pressure in a dog under the influence of digitalis. I, II, and III show progressive slowing of the pulse, rise of blood-pressure, and diminished oscillation due to contraction of the arterioles. when the action of digitalis was well marked. The general effect of the drug is to slow the pulse, raise the tension, and increase the actual force of each beat of the heart. The rise of tension is evidently due to con¬ tracted capillaries, for if they remained of the same size in the third section as in the first, the higher tension should drive the blood more quickly through them and the curve should fall more quickly during diastole, whereas the con¬ trary is the case. The power of the heart is
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