The use of the sphygmograph in clinical medicine / by Graham Steell.

  • Graham Steell
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: The use of the sphygmograph in clinical medicine / by Graham Steell. Source: Wellcome Collection.

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    Fig. 5. or not/ there will be a notch, the aortic between the tidal or Ijercussion wave, as the case may be, and the dicrotic wave. In low-tension pulses this notch is situated low down, i.e., it approaches the respii-atory line, while in high-tension pulses it is situated at a considerable distance above the respiratory line; in the former type of pulse the dicrotic wave is apt to be exaggerated while the opposite is the case in true high-tension pulses. These are the points in a sphygmogram that demand our attention in studying pulse-curves. For instance: When a tracing is taken of a low-tension pulse, while the patient is suffering from severe dyspnoea, the respiratory (Fig. 3) line is often seen to become undulating instead of being straight. In obstruction of the aortic orifice the upstroke often slopes instead of being perpendicular. In the same lesion the percussion wave is often practically abolished, the top of the curve being formed by the tidal wave (Fig. 6) while in incompetence of the aortic
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