By I. Tangach. Harris-Stowe State College.
The steamboat had taken form in Fulton’s mind buy avalide 162.5mg amex blood pressure check, before it had a commencement in fact. So was the spinning-jenny with Arkwright, and the electric telegraph with Morse, evolved from the mind and not from the machine shop or laboratory. And yet I would be the last one to depreciate experiment, or the advantage of observation, and the accumulation of facts. These are good if rightly used; good if properly classified and subject to the mind; not good if allowed to exert an undue control and govern the processes of thought. We use facts to reason from, and experiment to guide and prove the action of the mind. But we should not commence any investigation with a prejudiced mind, for in such case neither is the reason free or observation exact. Freedom from prejudice or bias is then the first requisite of these studies we are making, and the man who can not free himself from prejudice will always be a follower, never a leader in original investigation. We want the action of the mind, from facts to principles, guided by experiment, and the results proven by experiment. The first proposition we make is - That causes of disease act upon the living body, and their action is invariably to impair this life. Causes of disease are to be removed, when this is possible, and when it can be done without a still further impairment of life. The disease itself is a wrong in the life of the individual, and is as much a part of him as is healthy life at other times. Disease is opposed by remedies which influence the organism toward a healthy or right performance of its functions. Remedies, then, may be divided into two classes: (a) Those which remove causes of disease. The mind very soon separates them, and without our volition will have weighed the facts, found some of them wanting, and thrown these out, others imperfect and with a wrong meaning, others that have not had sufficient attention, etc. As the process of analysis goes on, it not only discusses probabilities, but wants to know how the results have been obtained. In the case of a remedy proposing to remove causes of diseases, it wants to know how it is done. Is it a chemical influence, combining with and neutralizing the cause, or does it extract it, as in pulling a thorn, removing a decayed tooth or a sequestrum, or is some organism forced to its removal, as when we produce emesis, catharsis, diaphoresis, diuresis, increased combustion, etc. How is the life of the individual influenced by such extraction or removal of disease. A man has taken Caustic Potash - what will be the result from a sufficient quantity of Sulphuric Acid to neutralize it? How is the life of the individual influenced by emetics, cathartics, diaphoretics, etc. Removing the cause of disease is a very good thing in some cases, a very bad thing in others. Good, when it can be done without too great impairment of life; bad, when it necessitates marked derangement of function, and impairment of life.
It is passing strange that doctors having eyes and a moderate amount of brains behind them buy 162.5mg avalide fast delivery blood pressure lab, should persistently use Quinine in the most varying and opposite states of disease - in cases which have not a single thing in common but periodicity, and persist in its use when failure follows failure, and the only result of its administration is quinism - far worse than the original disease. When a case of ague presents itself, we ask ourselves the question, is it simple, or is there functional or structural disease? If simple, the intermission is a state of perfect health, less a certain debility. If simple, we give Quinine at once; if complicated, we remove all functional and structural disease by appropriate remedies, and then, when simple, we give quinine if it is necessary. The patient being properly prepared for its action, has a single dose of sufficient quantity to break the ague (grs. This is best taken dissolved in a small quantity of water by the aid of sulphuric acid. I will be glad if some of our readers, who have an abundance of cases, would try the small dose. Has had a Thomsonian course of medicine, been freely purged with Podophyllin, and his liver tapped with Calomel and Blue Pill. His chill lasts from thirty minutes to two hours, and the fever severe, for six to ten hours, during which he suffers intensely. Examination during the intermission shows: a dry, harsh skin; a contracted tongue. The chill and fever became lighter each succeeding day, and did not recur after the fifth day. If I had not been employing the remedies to determine their full influence in curing an ague, I should have given Quinia, grs. He is a spare man, and in appearance quite different from his brother, but the chill and fever are quite as severe. Examination during the intermission shows: a dry, harsh skin; pulse 86, small and hard; temperature 99½; urine scanty and high-colored (coloring matter biliverdin); tongue contracted and reddened; bowels regular. Can not now take the smallest dose of Quinine without unpleasant head symptoms, and an increased severity in the fever. Had two recurrences of ague after the treatment was commenced, but made an excellent recovery. No means employed had done any good, except to break it on the father for one week. It is of the tertian type, but fortunately the sick day of one is the well day of the other.
The so-called Arthus reaction is observed when an individual is exposed to repeated small 2 doses of an antigen over a long period of time order avalide 162.5 mg amex prehypertension youtube, resulting in the induction of complexes and an antibody excess. Further exposure to the antigen, particu- larly dermal exposure, induces a typical reaction of edema and erythema which peaks after three to eight hours and disappears within 48 hours, but which sometimes leads to necrosis. Arthus-type reactions often represent occupational diseases in people exposed to repeated doses of environmental antigens: farmer’s lung (thermophilic Actinomyces in moldy hay), pigeon breeder’s lung (protein in the dust of dried feces of birds), cheese worker’s lung (spores of Penicillium casei), furrier’s lung (proteins from pelt hairs), malt-worker’s lung (spores of Aspergillus clavatus and A. This delayed skin reaction can serve as a test to confirm immunity against intracellular bacteria or parasites. Autoimmune T cells are usually directed against autoantigens that would otherwise be ignored (since they are only expressed in the extralymphatic periphery). Usage subject to terms and conditions of license Transplantation Immunity 115 basic protein in multiple sclerosis, against collagen determinants in poly- arthritis, and against islet cell components in diabetes. Interspecies re- jection is additionally contributed to by antibodies, and intolerance between complement activation mechanisms. Methods for reducing, or preventing, rejection include general immunosuppression, tolerance induction by means of cell chimerism, and sequestering of the transplanted cells or organ. This type of reaction results when immunologically respon- sive donor T cells are transferred to an allogeneic recipient who is unable to reject them (e. Usage subject to terms and conditions of license 116 2 Basic Principles of Immunology secondary lymphatic organs. Indeed the same foreign transplantation anti- gens are hardly immunogenic when expressed on fibroblasts or on epithelial or neuroendocrine cells, unless these cells are able to reach local lymphoid tissue. This can be achieved by using anti-T-cell antibo- dies, anti-lymphocyte antisera, and complement or magnetic bead cell-se- paration techniques. However, it is noteworthy that complete elimination of mature T cells leads to a reduction in the acceptance rate for bone marrow transplants, and that it may also weaken the anti-tumor effect of the trans- plant (desirable in leukemia). Bone Marrow Transplants Today & Reconstitution of immune defects involving B and T cells & Reconstitution of other lymphohematopoietic defects & Gene therapy via insertion of genes into lymphohematopoietic stem cells & Leukemia therapy with lethal elimination of tumor cells and reconstitution with histocompatible, purified stem cells, either autologous or allogenic. This also applies to transplants between monozygotic twins or genetically identical animals (syngeneic transplants). However, transplants between non-related or non-inbred animals of the same species (allogeneic transplants), and transplants between individuals of different species (xeno- geneic transplants) are immunologically rejected. These include the occurrence of natural cross-reactive antibodies, and a lack of complement in- activation by anti-complement factors (which are often species-incompatible and therefore absent in xenogeneic transplants), which together often results in hyperacute rejection within minutes, hours, or a few days—that is before any specific immune responses can even be induced. Three types of transplant rejection have been characterized: & Hyperacute rejection of vascularized transplants, occurring within min- utes to hours and resulting from preformed recipient antibodies reacting Kayser, Medical Microbiology © 2005 Thieme All rights reserved. Usage subject to terms and conditions of license Immune Defects and Immune Response Modulation 117 against antigens present on the donor endothelium, resulting in coagulation, thromboses, and infarctions with extensive necrosis. This is accompanied bya perivascular and prominent occurrence of T lymphocyte infiltrates. This is caused by low-level chronic T-cell responses, and can be mediated by cellular and hu- moral mechanisms. This can include obliterative vascular intima prolifera- tion, vasculitis, toxic, and immune complex glomerulonephritis.