Severe muscular strain, syphilis, chronic nephritis, gout, poisoning lead and alcohol are all importance. The aortic valves are especially susceptible damage from i need help with a research paper syphilis and from the prolonged high tension muscular strain. The left heart affected in the vast majority cases, and the auriculoventricular valves at least twice as frequently as the basic ones.
The right side chiefly involved in the fetus. Pathology.
The delicate valve tissue loses its translucent appearance, becomes opaque and thickened, eventually sclerotic, and in extreme cases lime salts are deposited.
The chordae tendineae become thickened, shortened, and may practically disappear.
The sclerotic us government resume writing service process may bind the edges the valve segments together in such a way as prevent their separation for the passage the blood current, or roll the hardened edge the valve as prevent from coming in sufficiently close apposition vnth its neighbor as secure the orifice against leakage.
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Stenosis results in the former instance, regurgitation in the latter. In old sclerotic processes at the aortic orifice a calcareous outgrowth may interfere with the passage the blood stream as produce the most violent vibration. The symptomatology chronic endocarditis will considered The effects the involvement the valves the heart in the acute forms endocarditis, which have been considering, may at once manifest, as in the more severe simple and malignant varieties. In most the cases which recover from the earlier illness, however, the symptoms which eventually are develop from the progressive changes which have only been started in the valves not show until months, and very often years, have elapsed. When finally the valves are damaged that they fail perform perfectly their functions, the patient comes under observation again, this time with the signs and symptoms some the different types valvular disease. In general the development leakage or obstruction at an orifice as a consequence valvulitis, does not immediately produce symptoms, because nature's conservative management the situation. In an arbitrary way will assume that a healthy heart has sufficient reserve force that habitually uses but one-fourth its normal power in a condition bodily rest.
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The subject able hard muscular labor involving two or three times the amount work that the heart habitually does when the body at rest, with stiU a fair amount help with essay papers power in reserve. If a valve becomes damaged as interfere with the ordinary progress the circulating stream blood through the heart, dilatation the cavity most affected occurs, and, with the increased demand for work in moving the larger quantity blood contained, a response in the way increased weight and strength essay help websites the muscular wall. In other words, hypertrophy the heart has occurred. In certain cases the preliminary dilatation not present.
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The heart now able an amount work above that which a heart normal size would capable, although part its extra force wasted because the valve lesion. Still its possessor can the ordinary work life with comfort, using a greater portion his heart power habitually than does the healthy man, and having a less reserve than normal. If content limit his activities such a degree that never uses all his reserve power, still able follow the ordinary work life without serious embarrassment. So soon as the damage from the valvular lesion, which unfortunately a progressive process as a rule, becomes great that even with his hypertrophy unable develop sufficient heart power for the ordinary calls life, much less keep any in reserve, his compensation broken and becomes an invalid that extent. Even in health one may use all his reserve power sudden severe exertion, as in an athletic contest, but the heart with rest quickly returns normal provided the strain has not been unusual severity, such as produce an acute dilatation, the effects which not dissertation research proposal help wholly clear with rest. So a cardiac invalid may temporarily use his reserve power and temporarily embarrass his compensation, but there comes a time when the injunction made permanent and his compensation broken.