A nurse is administering aspirin (ASA), a nonselective COX inhibitor, to a client who has rheumatoid arthritis. What are some of the specific indications of aspirin in this condition?
A.
It reduces inflammation, pain, fever, and platelet aggregation by blocking the production of prostaglandins.
B.
It prevents cardiovascular events such as myocardial infarction and stroke by inhibiting platelet aggregation and thromboxane synthesis.
C.
It treats gouty arthritis by inhibiting the enzyme xanthine oxidase and reducing the production of uric acid.
D.
It induces labor by stimulating uterine contractions and cervical ripening by blocking the production of prostaglandins.
The Correct Answer and Explanation is:
The correct answer is:
A. It reduces inflammation, pain, fever, and platelet aggregation by blocking the production of prostaglandins.
Explanation:
Aspirin (ASA), a nonselective cyclooxygenase (COX) inhibitor, is widely used in the management of various conditions, including rheumatoid arthritis (RA). RA is an autoimmune disease that primarily affects the joints, causing inflammation, pain, and damage to the cartilage and bones. Aspirin plays a significant role in the treatment of RA due to its ability to reduce inflammation, pain, and fever.
Aspirin works by inhibiting the enzyme cyclooxygenase (COX), which is involved in the synthesis of prostaglandins. Prostaglandins are lipid compounds that mediate various physiological processes, including the inflammatory response, pain signaling, and fever. By blocking the COX enzymes (both COX-1 and COX-2), aspirin reduces the production of prostaglandins, leading to decreased inflammation, pain, and fever, which are key symptoms in rheumatoid arthritis.
Additionally, aspirin’s effect on platelet aggregation is due to its irreversible inhibition of COX-1, which reduces the synthesis of thromboxane A2, a molecule that promotes platelet activation and aggregation. While this antiplatelet effect is more relevant in preventing cardiovascular events, it also contributes to the overall benefit in conditions like RA, where chronic inflammation may increase the risk of cardiovascular complications.
Unlike other medications, aspirin does not specifically target uric acid production (as in gout treatment) or induce labor (as prostaglandins do during childbirth). Instead, its primary function in RA is to manage the symptoms of inflammation and pain. Long-term use of aspirin in RA is often combined with other disease-modifying antirheumatic drugs (DMARDs) or biologics to slow disease progression and prevent joint damage. However, aspirin’s gastrointestinal side effects, including irritation, ulcers, and bleeding risk, should be carefully monitored, especially with long-term use.