"a client with osteoarthritis purchased a copper bracelet to wear and tells the nurse that there is less pain now. which response by the nurse is most appropriate? "

Copper bracelets and magnetic wristbands are used relieve pain in people with arthritis. Studies conducted on these devices show that they have no efficacy on pain or on stiffness, two of the most characteristic symptoms of arthritis. Although there is no medical data to support the efficacy of the copper bracelet, the patient is not harmed or endangered by wearing it. Therefore, the nurse should respect the fact that the patient is feeling better, but he/she should urge the patient to continue with its prescribed medication. 

Carbon dioxide is the correct answer

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