Osteoarthritis and osteophytes and anatomy
Nonsteroidal anti-inflammatory drugs (NSAIDs) exert their anti-inflammatory effect primarily by inhibiting an enzyme called cyclooxygenase (COX), also known as prostaglandin (PG) synthase. osteoarthritis and osteophytes and anatomy Breast cancer symptoms pain. COX catalyzes the conversion of the substrate molecule, arachidonic acid, to prostanoids. Prostanoids consist of prostaglandins E, D and F2a, prostacyclin and thromboxane. The major inflammatory vasoactive prostanoids are PGE2 and prostacyclin. osteoarthritis and osteophytes and anatomy Neurontin-arthritis-pain. Thromboxane is critical for platelet clotting, while PGD2 is involved in allergic reactions and PGF2a in uterine contraction. Non-steroidal Anti-inflammatory Agents The mechanism by which NSAIDs exert their anti-inflammatory and analgesic effects is via inhibition of the prostaglandin-generating enzyme, cyclooxygenase (COX) (see image above). In addition to their inflammatory potential, prostaglandins also contribute to important homeostatic functions, such as maintenance of the gastric lining, renal blood flow, and platelet aggregation. osteoarthritis and osteophytes and anatomy Hip arthritis. Reduction of prostaglandin levels in these organs can result in the well-recognized side effects of traditional non-selective NSAIDs - that is, gastric ulceration, renal insufficiency, and prolonged bleeding time. The elderly are at higher risk for these side effects. For example, adults over the age of 60 who are taking NSAIDs have a 4-5 fold higher risk of gastrointestinal bleeding or ulceration then their age-matched counterparts. Other risk factors for NSAID-induced GI bleed include prior peptic ulcer disease and concomitant steroid use. Potential renal toxicities of NSAIDs include azotemia, proteinura, and renal failure requiring hospitalization. Hematologic and cognitive abnormalities have also been reported with several NSAIDs. Therefore, in elderly patients, and those with a documented history of NSAID-induced ulcers, traditional non-selective NSAIDs should be used with caution, usually in lower dose and in conjunction with a proton pump inhibitor. Renal function should be monitored in the elderly.
Osteoarthritis and osteophytes and anatomy
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