Past exam of the medicine course of the University of Oxford / 1866 / Second examination / Pathology / 6

Distinguish between Gout and Rheumatism, acute and chronic.

Gout is a crystal-deposition disorder; “rheumatism” was a broader historical label that must be separated into acute rheumatic fever and several chronic joint disorders. In particular, chronic rheumatism is not a precise synonym for modern rheumatoid arthritis.

In acute gout, a sudden, intensely painful, red, hot and swollen anatomical joint is characteristic. The first metatarsophalangeal anatomical joint is a classic site, and early attacks often affect one anatomical joint with intervals of recovery. The material responsible is monosodium urate deposited in or around the anatomical joint, with an acute inflammatory reaction. High serum urate supports the diagnosis but neither guarantees clinical gout nor excludes it when a sample during a flare is ordinary.^[ref]

In chronic gout, persistent deposits can form tophi, including periarticular nodules and deposits in the ear or other cooler sites. Surrounding inflammatory tissue and fibrosis accompany the deposits; recurrent damage can erode articular structures and cause deformity and persistent symptoms. More than one anatomical joint may then be affected. The chalk-like material is a deposit of urate, not new bone, and not merely an accumulation of ordinary pus.^[ref]

The classical acute rheumatism of this comparison is usually acute rheumatic fever. In its typical articular presentation, fever accompanies painful inflammation that migrates between large anatomical joints, rather than repeatedly selecting one small distal site. In modern terms it is a delayed immune-mediated sequel of Group A streptococcal infection. Carditis, especially involvement of cardiac cardiac valves, is a major distinguishing concern; chorea and characteristic skin manifestations may also occur. The articular illness usually subsides without the progressive urate deposits of chronic gout. The later understanding of the streptococcal cause must be distinguished from nineteenth-century constitutional theories.^[ref]

For chronic rheumatism, distinguish at least two important modern patterns. Rheumatoid arthritis causes persistent inflammatory synovitis, commonly affecting corresponding small anatomical joints on both sides. Thickened inflamed synovium and invasive pannus can damage cartilage and bone, producing lasting deformity. Osteoarthritis, also historically included among chronic or deforming rheumatic complaints, instead emphasizes loss of articular cartilage, altered underlying bone and osteophytes. These conditions cannot be identified merely by saying that the anatomical joints have been painful for a long time.^[ref][ref]

A modern discriminating examination for suspected gout examines aspirated synovial fluid with a polarizing microscope. Needle-like, strongly negatively birefringent monosodium urate crystals support the diagnosis; a suitable compensator helps assess their optical behaviour.^[ref] This is later diagnostic technique, not a test claimed to have been supplied in 1866. Microbiological culture addresses a different alternative, septic arthritis; crystals and infection can coexist. Clinical distribution and duration remain useful, but neither appearance nor a single serum urate value settles every case.^[ref]

Acute versus chronic describes the course; gout versus a particular rheumatic disease identifies a mechanism. The two distinctions must be made separately.