Arthritis, Rheumatoid (RA)
- Rheumatoid arthritis (RA) is a chronic inflammatory disease primarily causing synovial inflammation and leading to the destruction of bone and cartilage (1).
- Classification: based on the duration of disease (1)
- Early: ≤6 months
- Established: ≥6 months
- Based on the disease activity: low, moderate, high, or remission
Annual incidence: the United States is approximately 40 per 100,000 persons.
- Prevalence: 0.2–1% of the general population worldwide
- Female:male, 2:1
- Males more likely to develop extra-articular RA
Etiology and Pathophysiology
The cause remains uncertain; often precipitated by stress or insult (e.g., infection, smoking, trauma, inhalants, mucosal dysbiosis, chronic lung diseases)
Estimated heritability 40%, >100 risk loci, HLA-DRB1 (the strongest genetic predisposition)
Females at a younger age (5th to 6th decade), first- and second-degree relative, North American regions, Native Americans, smoking, obesity, lower socioeconomic status, infections
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