20 Spec. Pathologie und Therapie, 1847, ii. p. 609.
21 Vide Am. Jour. Med. Sciences, April, 1875, vol. lxix. 339-348.
22 Trans. International Med. Congress, 1881, ii. 93.
In order that peripheral irritation shall thus induce inflammation of the joints and the other affections of muscles, tendons, fasciæ, etc. which are called rheumatic, he holds with the French School that the arthritic diathesis must exist, or that state of tissue-health which involves a tendency to temporary inflammation of many joints or fibrous structures at once, or to repeatedly recurrent attacks of inflammation of one joint or fibrous structure. If I understand Mr. Hutchinson correctly, he also holds that a nerve-tissue peculiarity exists which renders persons liable to rheumatism. He does not indicate either the cause or the nature of the nerve-tissue peculiarity. But modern pathology teaches that the functional conditions of the nervous centres known as neuroses, whether inherited or acquired, reveal themselves as morbid manifestations of nerve-function on the part of special portions of or the entire nervous system, and, as Dr. Dyce Duckworth has well pointed out, these neuroses may be originated, when not inherited, in various ways, as by excessive activity of the nervous system, by prolonged or habitual excesses, etc. "Thus, undue mental labor, gluttony, alcoholic intemperance, debauchery, and other indulged evil propensities in the parent come to be developed into definite neurotic taint and tendency in the offspring."
But is there nothing more in acute articular rheumatism than an inflammation of certain structures, articular and visceral, lighted up in an individual of a neuro-arthritic diathesis? What do we learn from that closely-allied affection, gout, which involves especially the same organs as rheumatism, and is held by many of the ablest pathologists to belong to the same basic diathesis as it? Duckworth23 has very ably advocated a neurotic theory of gout, but it is admitted on all hands—and by Duckworth himself—that in gout a large part of the phenomena is due to perverted relations of uric acid and sodium and to the presence of urate of soda in the blood. May we not from analogy, as well as from other evidence, infer that in that so-called other neurosis, rheumatism, a considerable part of the phenomena is due to perversions of the processes of assimilation and excretion, and to the presence of some unknown intermediate product of destructive metamorphosis—lactic or other acid? This is admitted by Maclagan and strongly advocated by Senator; and in this way the pathology of the disease may be said to embrace the humoral as well as the solidist doctrines—the resulting theory being a neuro-humoral one. No doubt pathological chemistry and clinical investigation will ere long make important discoveries respecting the pathology of acute rheumatism which shall maintain the close alliance believed to exist between that affection and gout.
23 Brain, April, 1880.
The miasmatic theory, so ably advocated by Maclagan,24 assumes that rheumatism is due to the entrance into the system from without of a miasm closely allied to, but quite distinct from, malaria. His argument on this topic is ingenious and elaborate, yet has not been favorably received by pathologists. Opposed to it are the following amongst other considerations: Heredity exercises a marked influence upon the occurrence of rheumatism; unlike malarial disease, no climate or locality is immune from rheumatism; the many indications that a diathesis plays a chief rôle in rheumatism; the remarkable influence exerted by cold and dampness in the etiology of the disease.
24 Rheumatism: its Nature, Path., etc., London, 1881, pp. 60-95.
Heuter's25 infective-germ theory, like the miasmatic, refers rheumatism to a principle not generated in the system, but introduced from without. A micrococcus enters the dilated orifices of the sweat-glands, and, reaching the blood, first sets up an endocarditis, and then capillary emboli produce the articular inflammations. This is a reversal of what really happens, so far as the time of invasion of the endocardium and the synovial membranes is concerned; and Fleischauer's case, in which miliary abscesses were found in the heart, lungs, and kidneys, was probably one of ulcerative endocarditis, which, after all, is a rare complication of acute articular rheumatism. Moreover, it is a gratuitous assertion to say that endocarditis exists in all cases of the disease. If, however, Heuter were content to say that acute articular rheumatism was produced by a specific germ, as held by Recklinghausen and Klebs, which on entering the system acted specially upon the joints and the fibro-serous tissues, as the poison of small-pox does upon the skin, while at the same time it sets up general disturbances of the entire economy as other zymotic poisons do, there would be nothing opposed to general pathological laws. Even the existence of a diathesis capable of favoring the action of the specific germ would be analogous to the tuberculous diathesis, which favors the action of the bacillus of tubercle; and cold, its ordinary exciting cause, might be regarded simply as a condition which renders the system more susceptible to the action of the germ, and the modus operandi of cold in doing this might be variously explained.
25 Klinik der Gelenkkrankheiten, Leipzig, 1871.