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- W1935917013 abstract "A 70 year old obese woman asks if more can be done for her knee and low back pain, due to osteoarthritis. She used to smoke and has type 2 diabetes. Her orthopaedic surgeon does not consider the clinical presentation and radiographic changes in her knees severe enough for surgery. Her height is 160 cm, weight 85 kg, blood pressure 130/80 mm Hg, with normal renal function, plasma cholesterol concentration 5.5 mmol/L, and HDL cholesterol concentration 0.9 mmol/L. Her present drug treatment is paracetamol (4 g daily) and metformin.NSAIDs act by inhibiting cyclo-oxygenase-1 (COX-1) and COX-2 enzymes, which are involved in prostaglandin synthesis, resulting in their analgesic, anti-inflammatory, and antipyretic effects (figure⇓). Although the boundary is blurred, there are two broad groups of NSAIDs—the older, traditional, non-selective NSAIDs that inhibit both COX-1 and COX-2 and the newer, selective COX-2 inhibitors that predominantly inhibit COX-2 (figure⇓). The non-selective NSAID aspirin is used primarily for its antiplatelet effect, thus reducing the risk of myocardial re-infarction and stroke.Arachidonic acid is metabolised by the cyclo-oxygenase isoenzymes COX-1 and COX-2 to intermediate prostaglandins (PGG2, then PGH2), which are then converted to other prostaglandins that are mediators of pain, inflammation, and fever, and are gastroprotective. Thromboxane A2 causes platelet aggregation, and prostacyclin produces vasodilation. By blocking COX enzymes, NSAIDs inhibit the synthesis and thus the effects of prostaglandins, prostacyclin, and thromboxane A2. The clinical effects of NSAIDs depend largely on their selectivity for these enzymes. Aspirin works by irreversibly inhibiting COX-1 mediated synthesis of thromboxane A2, and is used to inhibit platelet aggregationTable 1⇓ shows the indications and effectiveness of the various NSAIDs. There is little difference in their mean efficacy, although a review of individual patient data indicates that patients vary in …" @default.
- W1935917013 created "2016-06-24" @default.
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- W1935917013 date "2013-09-06" @default.
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- W1935917013 title "Correction" @default.
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- W1935917013 doi "https://doi.org/10.1136/bmj.f3195" @default.
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