Physiology and biochemistry in modern medicine . ble and elastic the wall of the tubeis, the longer will it take for the wave of pressure to travel from oneend to the other. 200 THE CIRCULATION OF THE BLOOD Alteration in the rate of transmission of the pulse wave in the arter-ies of man depends entirely upon an application of these the arteries become hardened in old age, the rate of transmissionof the pulse wave is markedly increased. The pulse is also transmittedmore rapidly in the vessels of the lower extremities than in those of theupper, since in the former the blood vesse
Physiology and biochemistry in modern medicine . ble and elastic the wall of the tubeis, the longer will it take for the wave of pressure to travel from oneend to the other. 200 THE CIRCULATION OF THE BLOOD Alteration in the rate of transmission of the pulse wave in the arter-ies of man depends entirely upon an application of these the arteries become hardened in old age, the rate of transmissionof the pulse wave is markedly increased. The pulse is also transmittedmore rapidly in the vessels of the lower extremities than in those of theupper, since in the former the blood vessels are somewhat more in the transmission of the pulse wave is further observed as oneof the signs of aneurism in a vessel; as is well known, aneurism of thesubclavian artery on one side causes a delay of the pulse on that sidethat is perceptible to the fingers. The Contour of the Pulse Curves For more particular study of the exact contour of the pulse wave, andespecially for determining the time relationships of the secondary waves,. Fig. 57.—Diagram of Chauveaus dromograph. a, tube for introduction into the lumen of theartery, and containing a needle or vane, which passes through the elastic membrane in its sideand moves by the impulse of the blood current; c, graduated scale for measuring the ofthe oscillations of the needle. a large variety of methods of varying degrees of accuracy have beenelaborated for each kind of pulse. Those devised for measuring the pressure pulse have already been de-scribed (see page 127), and for the other pulses they are as follows: Velocity Pulse.—Much ingenuity has been displayed in the elabora-tion-of methods for recording the velocity pulse. In one of these theartery is cut across and the ends attached to a tube, into the lumenof which projects a paddle or vane articulated with a light lever, whichpasses through its wall, (see Fig. 57). The vane floats in the bloodstream, and the outer end of the lever to which it is at
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