. Diseases of the heart and thoracic aorta. s, has convinced him that, although this explanation applies to many cases, it yet does not express thewhole truth, and that in some instances at least there is a real first secondarywave or oscillatory expansion in the artery, the tidal or predicrotic wave.—youmal of Anatomy and Physiology, vol. x. p. 299. 26o Diseases of the Heart. due to a dilated condition of the small arteries and (?) capil-laries. In such cases the pulse rapidly falls away during theventricular systole, in other words, after the first distention ofthe arterial wall there i
. Diseases of the heart and thoracic aorta. s, has convinced him that, although this explanation applies to many cases, it yet does not express thewhole truth, and that in some instances at least there is a real first secondarywave or oscillatory expansion in the artery, the tidal or predicrotic wave.—youmal of Anatomy and Physiology, vol. x. p. 299. 26o Diseases of the Heart. due to a dilated condition of the small arteries and (?) capil-laries. In such cases the pulse rapidly falls away during theventricular systole, in other words, after the first distention ofthe arterial wall there is a quick and rapid collapse, which isonly arrested by the occurrence of the dicrotic wave; and thisis, as we have seen, chiefly a recoil wave from the closed aorticvalves. A rapid collapse of this description is best markedin the dicrotic and hyperdicrotic pulse of fever, and in con-ditions of vaso-motor debility and relaxed vessels. Henceit will be easily understood why in these cases the secondventricular systolic wave is not Fig. ioo.—Irregiilai- Fulse in initraL regurgitation, with liypertrophy of the LeftVentricle.—In the tallest curves the tidal wave, a, is well-marked, while itis absent in the smaller ones. The letters a, a, point to the predicrotic wave.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectheart, bookyear1884
