RT Book, Section A1 Reta, Alison M. A1 O’Callaghan, Rory A1 Chen, Steven W. A1 Mardis, Caitlin A2 Sutton, S. Scott SR Print(0) ID 1158315884 T1 Rheumatoid Arthritis T2 McGraw-Hill's NAPLEX® Review Guide, 3e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781260135923 LK accesspharmacy.mhmedical.com/content.aspx?aid=1158315884 RD 2024/04/20 AB Rheumatoid arthritis (RA) is the presence of chronic inflammation and symmetric erosive synovitis leading to joint deterioration and deformity. The onset is usually at a young age (15-45 years) and occurs more frequently in women than in men. RA is an autoimmune disease involving T-lymphocytes, B-lymphocytes, macrophages, and cytokines, but the exact etiology is unknown. T-lymphocytes produce proinflammatory cytokines and cytotoxic substances that lead to the erosion of bone and cartilage. Activated B-lymphocytes produce plasma cells which form antibodies that attack joint tissues. Macrophages release prostaglandins and cytotoxins to cause further injury and inflammation.