A system of practical medicine. By American authors. Vol. 2

by Unknown

¹¹⁷ Essai sur la Convalescence du Rheumatisme Artic. Aigue, Paris, 1881, 66.

Subacute Articular Rheumatism.

Under this head Charcot, Besnier, and Homolle describe an affection which corresponds closely with one variety of the disease commonly called rheumatoid arthritis, but the writer employs the term with the same significance as most modern English authors (Garrod, Sutton, Flint, Maclagan). It is milder yet more enduring than the acute form, but their symptoms are identical in kind. It is usually subacute from the outset, although occasionally succeeding the acute type. The febrile disturbance is but slight, rarely reaching 101°, and the perspiration is less abundant; there is less pain, heat, and tenderness in the joints, and only a few of them are involved together; but although the articular affection moves from joint to joint, it persists for weeks or months in several of them or in one only, improving and relapsing generally without apparent reason. However, it does not seriously damage the articulations, and they ultimately quite recover. Mild cardiac affections also occur, but less frequently, and the serious disturbances of the cerebral and respiratory systems are very seldom met with. The gradations between subacute articular rheumatism and the acute form on the one hand, and the simple chronic form on the other, are almost innumerable. Marked anæmia is as much a feature of subacute as of acute articular rheumatism, and its victims are often of unhealthy or asthenic constitution, and subject to recurring attacks of the disease on but slight provocation. The return of warm weather often relieves such cases.

THE MORBID ANATOMY OF ACUTE AND SUBACUTE ARTICULAR RHEUMATISM.—Although opportunities of ascertaining the conditions of the articulations in acute articular rheumatism are rare, yet it is now established that the process is an inflammation involving chiefly the synovial membrane, and to a less degree the cartilages, ligaments, tendinous sheaths, and in some cases even the bones and periarticular soft parts. The synovial membrane is more or less injected and reddened diffusely or in patches, especially where it forms fringe-like folds and at its line of union with the cartilage. It is somewhat thickened, opaque, and devoid of its satin-like lustre, and in somewhat protracted cases covered here and there with a thin, easily detached neo-membranous formation. Within the articulations will be found from a few drops to one or two ounces of a viscid, pale, citron- or reddish-colored fluid, like synovia, but more fluid, and generally turbid and containing transparent or semi-opaque gelatinous masses or albumino-fibrinous flocculi. The microscope reveals in the effusion large detached spherical epithelial cells in various stages of germination or of fatty degeneration, and a variable number of red blood-corpuscles and pus-cells. Very exceptionally, the effusion is mixed with more or less true pus. In two out of the eight fatal cases reported by Fuller, in which the joints were examined, pus in moderate quantity was found along with other products in some, but not in all, of the inflamed articulations, and one of them was complicated with erysipelas, the other with sloughs over both trochanters. In very severe forms complicated with hemorrhagic tendencies the inflammatory products have contained a large proportion of blood. Cornil et Ranvier¹¹⁸ insist that even in slight cases of rheumatic arthritis the diarthrodial cartilage constantly suffers changes arising from nutritive irritation and proliferation of the cartilage-cells. At first the cartilage loses here and there some of its polished hyaline appearance, and the microscope reveals a finely-striated condition of its structure which gives it a velvety aspect. When the inflammation has been more severe and of longer duration, so that the deeper layers have been involved, the unaided eye will perceive local swellings in which the natural elasticity and resistance of the cartilage are impaired, and its surface is fissured or villous-like in appearance. "In certain rare cases of mono-articular acute arthritis true ulcerations of the cartilage are observed."

¹¹⁸ Manual d'Histologie pathologique, Paris, 1869, 406.

The soft parts in the immediate vicinity of the inflamed joints may be in some cases more or less congested and oedematous, and the tendinous sheaths, and even the bursæ mucosæ, inflamed and distended with inflammatory products like those in the articulations. Charcot,¹¹⁹ holding the opinion that arthritis deformans is but a chronic variety of articular rheumatism, quotes Gurlt's statement that in acute articular rheumatism "the medullary tissue of the ends of the bones undergoes a great increase of vascularity, with proliferation of its corpuscles," and remarks that Hasse and Kussmaul have also referred to lesions of the bone and periosteum in that disease. But the condition of the osseous parts of the joints in acute articular rheumatism can hardly be said to be known, and it is premature to speak positively respecting it.

¹¹⁹ Clinical Lectures on Acute and Chronic Diseases, Sydenham Soc., 1881, p. 148.

Finally, in subacute rheumatism the alterations in the synovial membrane, and especially in the cartilages just described, are likely to be more marked than in the acute form.

The DIAGNOSIS of acute polyarticular rheumatism is seldom difficult in adults, but when acute rheumatism localizes itself in one joint or occurs in infancy or early childhood, a diagnosis, especially an early one, sometimes cannot be easily established. The considerations by which acute polyarticular rheumatism may be distinguished from acute gout, subacute rheumatoid arthritis, and gonorrhoeal rheumatism will be given in connection with those topics.

Pyæmia has perhaps been confounded with acute articular rheumatism more than any other disease, but the rheumatic affection, unlike the pyæmic, is not necessarily connected with any pre-existing condition capable of causing purulent infection of the blood or system, such as a wound, fracture, abscess, or a local inflammation of bone, periosteum, vein, pelvic organ, or a specific fever (variola, relapsing, typhoid, glanders, etc.); it does not present severe rigors, which recur at irregular intervals and are attended with teeth-chattering and a high temperature, 104° to 105°, rapidly attained; its type of fever is not so intermittent or markedly remittent as that of pyæmia; its profuse sweating continues although the temperature remains febrile, but that of pyæmia coincides with the decline of the temperature; unlike pyæmia, it only very rarely produces profound constitutional disturbance of a typhoid character, and has no tendency to run a rapidly fatal course in eight to ten days or in two or three weeks; its visceral inflammations are chiefly cardiac, pleural, and pulmonary, and tend to resolve; those of pyæmia are especially pulmonary, pleural, and hepatic, although frequently cardiac also, and generally produce suppuration and destruction of tissue. Multiple subcutaneous abscesses and cutaneous blebs and pustules do not occur in acute articular rheumatism, and its articular affection differs in many respects from that of pyæmia; many more joints are involved; the inflammation is erratic, very rarely fixed, and generally resolves without damage to the articulation; the affected joint is usually hotter, redder, more painful, and more sensitive, and the swelling is less diffused, and its outline corresponds more accurately with that of the synovial capsule. Sometimes acute articular rheumatism is complicated with the phenomena of pyæmia, as when so-called ulcerative endocarditis obtains.