Palindromic rheumatism

Presentation

The exact prevalence of palindromic rheumatism in the general population is unknown, and this condition is often considered a rare disease by non-rheumatologists. However, a recent Canadian study showed that the incidence of PR in a cohort of incident arthritis was one case of PR for every 1.8 cases of rheumatoid arthritis (RA). The incidence of PR is less than that of RA but is not as rare as previously thought.

Palindromic rheumatism is a syndrome presented with inflammatory para-arthritis (soft tissue rheumatism) and inflammatory arthritis both of which cause sudden inflammation in one or several joints or soft tissue around joints. The flares usually present with mono- or oligo-articular involvement, which have onset over hours and last a few hours to a few days, and then go away completely. However episodes of recurrence form a pattern, with symptom-free periods between attacks lasting for weeks to months. The most commonly involved joints were knees, metacarpophalangeals and proximal interphalangeal joints of the hands or feet. Constitutionally, there may or may not be a fever and swelling of the joints. The soft tissues are involved with swelling of the periarticular tissues, especially heel pads and finger pads. Nodules may be found in the subcutaneous tissues. The frequency of attacks may be variable over the course but there is no joint damage after attacks.

It typically affects people between the ages of 20 and 50. One study showed an average age of onset of 49.

A population cohort study in Taiwan suggested that patients with PR had an increased risk of developing rheumatoid arthritis, systemic lupus erythematosus, Sjogren's syndrome, systemic sclerosis, and polymyositis.

Causes

Palindromic rheumatism is a disease of unknown cause. It has been suggested that it is an abortive form of rheumatoid arthritis (RA), since anti-cyclic citrullinated peptide antibodies (anti-CCP) and antikeratin antibodies (AKA) are present in a high proportion of patients, as is the case in rheumatoid arthritis. Unlike RA and some other forms of arthritis, palindromic rheumatism affects men and women equally.

Diagnosis

Due to the symptoms of palindromic arthritis and the nature of the attacks, diagnosis can be difficult or take a long time. The symptoms can be similar to many other forms of arthritis or other autoimmune diseases. It is often a case of eliminating the other conditions before getting the correct diagnosis due to there being no specific test for PR diagnosis.

No single test can confirm a diagnosis. A doctor may make a diagnosis based on medical history and signs and symptoms. Palindromic rheumatism must be distinguished from acute gouty arthritis and an atypical, acute onset of rheumatoid arthritis (RA). Without specific tests (such as analysis of joint fluid), it may be difficult to distinguish palindromic rheumatism from other episodic joint problems. It is important to note that a person may experience more than one autoimmune disorder at the same time, as overlap syndrome. Laboratory findings are usually normal. Blood tests may show an elevation of the ESR and CRP, but are otherwise unremarkable. Rheumatoid factor may be present especially in the group that is likely to develop rheumatoid arthritis.

Proposed classification by Guerne and Weismann in 1992:

• A 6-month history of brief sudden-onset and recurrent episodes of monoarthritis or rarely polyarthritis or of soft tissue inflammation.
• Direct observation of one attack by a physician.
• Three or more joints involved in different attacks.
• No radiologic evidence of bone or joint erosion.
• Exclusion of other arthritides, such as rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), or gout

Management

Treatment may include nonsteroidal anti-inflammatory drugs (NSAIDs) for acute attacks. Antimalarials, such as hydroxychloroquine, have been helpful in reducing the frequency and duration of attacks and may reduce the likelihood that palindromic rheumatism will progress to rheumatoid arthritis.

Etymology

Palindromic rheumatism derives its name from the Greek palindromos meaning to take the same road once again (palin, again + dromos, pathway) emphasizing how the illness begins and ends in a similar way. The term "palindrome" means a word that is spelled the same forward as backward (examples include "kayak" and "mum").

References

References

1. (February 2017). "What can palindromic rheumatism tell us?". [[Best Practice & Research: Clinical Rheumatology]].
2. (October 2013). "Palindromic rheumatism: a reappraisal". [[International Journal of Clinical Rheumatology]].
3. (June 2008). "Palindromic rheumatism is a common disease: comparison of new-onset palindromic rheumatism compared to new-onset rheumatoid arthritis in a 2-year cohort of patients". [[The Journal of Rheumatology]].
4. (August 2012). "A multicenter study of clinical and laboratory findings of palindromic rheumatism in Iran". [[Asia Pacific League of Associations for Rheumatology#Journal.
5. (2018). "Risk of autoimmune rheumatic diseases in patients with palindromic rheumatism: A nationwide, population-based, cohort study". [[PLOS One]].
6. (August 2003). "Prevalence and clinical significance of anti-cyclic citrullinated peptide and antikeratin antibodies in palindromic rheumatism. An abortive form of rheumatoid arthritis?". [[Rheumatology (journal).
7. (August 2013). "Palindromic rheumatism: consider Whipple's disease". International Journal of Rheumatic Diseases.
8. (October 1992). "Palindromic rheumatism: part of or apart from the spectrum of rheumatoid arthritis". The American Journal of Medicine.
9. "Palindromic Rheumatism".