Tài liệu Báo cáo y học: "The validity of a rheumatoid arthritis medical records-based index of severity compa

Rheumatoid arthritis (RA) is a chronic inflammatory disease that can lead to long-term joint damage resulting in chronic pain, loss of function, and disability [1]. It causes substantial morbidity in most patients and premature mortality in many [2-5]. Some patients with severe RA may be at higher risk for complications such as infection, gastrointestinal problems, heart disease, and cancer [6,7]. However, those complications may be related to adverse effects of drug therapies rather than to the effect of RA.