A nurse in a provider's office is assessing a patient who has rheumatoid arthritis (RA). Which of the following findings is a late manifestation of this condition?

Choice A rationale Weight loss can occur at various stages of rheumatoid arthritis due to chronic inflammation and increased metabolic demands. While it can be present later in the disease, it is not specifically identified as a late manifestation. Systemic inflammation leads to the release of pro-inflammatory cytokines, which can affect appetite and metabolism, contributing to weight changes throughout the course of the disease. Choice B rationale Knuckle deformities, such as swan neck and boutonniere deformities, are characteristic late manifestations of rheumatoid arthritis. These deformities result from chronic inflammation and synovial proliferation leading to damage of the tendons, ligaments, and joint capsule around the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints. Over time, this causes the characteristic changes in finger alignment. Choice C rationale Low-grade fever can be a systemic manifestation of the inflammatory process in rheumatoid arthritis, but it is more commonly seen during active flares and is not specifically classified as a late manifestation. The fever is a result of the release of pyrogens, such as interleukin-1 and tumor necrosis factor-alpha, during periods of heightened immune activity. Normal body temperature ranges from 97.8°F to 99.1°F (36.5°C to 37.3°C). Choice D rationale Anorexia, or loss of appetite, can be associated with the chronic pain and systemic inflammation of rheumatoid arthritis at any stage. Inflammatory cytokines can affect appetite regulation in the hypothalamus. While it might persist in later stages, it is not a definitive late manifestation compared to structural joint changes.