Preemptive analgesia: it starts before surgery.
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McCaffery
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D000698:Analgesia / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage*; D000779:Anesthetics, Local / Q000008:administration & dosage*; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage*; D004311:Double-Blind Method; D005283:Fentanyl / Q000008:administration & dosage*; D006801:Humans; D010149:Postoperative Pain / Q000517:prevention & control*; D011300:Preoperative Care; D011446:Prospective Studies; D016032:Randomized Controlled Trials as Topic
D000701:Analgesics, Opioid; D000779:Anesthetics, Local; D000894:Anti-Inflammatory Agents, Non-Steroidal; D005283:Fentanyl