. Diseases of the heart and thoracic aorta. to be represented, undernormal circumstances, by a slow and gradual ascent inter-rupted by two or three small waves {k, /, and «). When the blood-flow into the ventricle is unusually rapid,as it is for instance in free regurgitation through the aorticor mitral orifices, and more especially when both aortic andmitral regurgitation are present, the line of ascent whichmarks the diastolic filling of the ventricles is much moreabrupt than usually. (See figs. 309 and 310.) When, on the contrary, the blood-flow into the ventricleis abnormally slow, as it i
. Diseases of the heart and thoracic aorta. to be represented, undernormal circumstances, by a slow and gradual ascent inter-rupted by two or three small waves {k, /, and «). When the blood-flow into the ventricle is unusually rapid,as it is for instance in free regurgitation through the aorticor mitral orifices, and more especially when both aortic andmitral regurgitation are present, the line of ascent whichmarks the diastolic filling of the ventricles is much moreabrupt than usually. (See figs. 309 and 310.) When, on the contrary, the blood-flow into the ventricleis abnormally slow, as it is in mitral stenosis, the diastolicportion of the tracing may be of much longer duration thanin health.^ (Sec fig. 311.) I say 7nay be, for in mitral stenosis the rhythm is often perverted ; the leftauricle is apt to contract at irregular intervals, and in some of the individualcardiographic curves the diastolic portion may be shortened, while in themajority it is, as we should expect, increased. Analysis of a CardiograpJiic tracing. 769. Fig. 309.— Cardiogram in a case of aortic regurgitation. — {After Galahin.) The heart was much dilated, the apex beat being in the sixth intercostal space,and external to the line of the nipple. The pulse tracing showed extremecollapse in the diastolic portion, and an almost entire absence of the tidal this it may be inferred that the regurgitation was very free, and the contrac-tions of the heart short and incomplete. The tracing is partly inverted, and aretraction occurs during the latter part of systole, followed by a sudden recoil.—{G2cys Hospital Reports, 1875, p. 312.)
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectheart, bookyear1884
