. Diseases of the heart and thoracic aorta. front, a reflux takes place, which,being stopped by the valves, causes a second increase of pressure and secondexpansion. This is propagated as the dicrotic wave into the periphery, and mayitself again call out a second similar oscillation or tricrotic wave, which is notunfrequently seen in the pulse. Even in the total absence of aortic valves, thereflux, meeting with the current entering the ventricle, may cause a second Analysis of a Sphygmographic Traci7ig. 253 opening and closing waves, etc., or in fact to secondary waves at all, ofwhatever chara
. Diseases of the heart and thoracic aorta. front, a reflux takes place, which,being stopped by the valves, causes a second increase of pressure and secondexpansion. This is propagated as the dicrotic wave into the periphery, and mayitself again call out a second similar oscillation or tricrotic wave, which is notunfrequently seen in the pulse. Even in the total absence of aortic valves, thereflux, meeting with the current entering the ventricle, may cause a second Analysis of a Sphygmographic Traci7ig. 253 opening and closing waves, etc., or in fact to secondary waves at all, ofwhatever character. The tracings which he obtained from the openedartery of a rabbit, under a normal blood-pressure, never showed theslightest trace of secondary waves superposed on the primaiy or pulsewave, although the instrument he used was quite delicate enough torecord them did they really exist.—Michael Fosters Journal of Phy-siology, 1879-80, p. 76. The dicrotic wave is absent or feebly marked in freeaortic regurgitation. (See figs. 84 and 85.).
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