[1. Rathmell JP, Pino CA, Taylor R, Patrin T, Viani BA. Intrathecal morphine for postoperative analgesia: a randomized, controlled, dose-ranging study after hip and knee arthroplasty. Anesth Analg. 2003; 97:1452-7.10.1213/01.ANE.0000083374.44039.9E]Open DOISearch in Google Scholar
[2. Bailey PL, Rhondeau S, Schafer PG, Lu JK, Timmins BS, Foster W, et al. Dose response pharmacology of intrathecal morphine in human volunteers. Anesthesiology. 1993; 79:49-59.10.1097/00000542-199307000-00010]Open DOISearch in Google Scholar
[3. Fischer HBJ, Simanski CJP, Sharp C, Bonnet F, Camu F, Neugebauer, et al. A procedure-specific systematic review and consensus recommendation for postoperative analgesia following total knee arthroplasty. Anaesthesia. 2008; 63:1105-23.10.1111/j.1365-2044.2008.05565.x]Open DOISearch in Google Scholar
[4. Niruthisard S, Werawatganon T, Bunburaphong P, Ussawanophakiat M, Wongsakornchaikul C, Toleb K. Improving analgesic efficacy of intrathecal morphine with parecoxib after total abdominal hysterectomy Anesth Analg. 2007; 105:822-4.10.1213/01.ane.0000277489.87015.1d]Open DOISearch in Google Scholar
[5. Price DD, McGrath PA, Rafii A, Buckingham B. The validation of visual analogue scales as ratio scale measures for chronic and experimental pain. Pain. 1983; 17:45-56.10.1016/0304-3959(83)90126-4]Open DOISearch in Google Scholar
[6. Kindler CH, Harms C, Amsler F, Ihde-Scholl T, Scheidegger D. The visual analog scale allows effective measurement of preoperative anxiety and detection of patients’ anesthetic concerns. Anesth Analg. 2000; 90:706-12.10.1097/00000539-200003000-0003610702461]Open DOISearch in Google Scholar
[7. Macintyre PE, Upton R. Acute pain management in the elderly patient. In: Macintyre PE, Walker SM, Rowbotham D, eds. Clinical Pain Management: Acute Pain. 2nd ed. London: Hodder Arnold; 2008.10.1201/b13460]Search in Google Scholar
[8. Mathiesen O, Jacobsen LS, Holm HE, Hilsted KL, Dahl JB. Pregabalin and dexamethasone for postoperative pain control: a randomized controlled study in hip arthroplasty. Br J Anaesth. 2008; 101: 535-41.10.1093/bja/aen21518653493]Open DOISearch in Google Scholar
[9. Zhang J, Ho KY, Wang Y. Efficacy of pregabalin in acute postoperative pain: a meta-analysis. Br J Anaesth. 2011; 106:454-62.10.1093/bja/aer02721357616]Open DOISearch in Google Scholar
[10. Kohli M, Murali T, Gupta R, Khan P, Bogra J. Optimization of subarachnoid block by oral pregabalin for hysterectomy. J Anaesthesiol Clin Pharmacol. 2011; 27:101-5.10.4103/0970-9185.76661]Search in Google Scholar
[11. Engelman E, Cateloy F. Efficacy and safety of perioperative pregabalin for post-operative pain: a meta-analysis of randomized-controlled trials. Acta Anaesthesiol Scand. 2011; 55:927-43.10.1111/j.1399-6576.2011.02471.x21707548]Search in Google Scholar
[12. Ben-Menachem E. Pregabalin pharmacology and its relevance to clinical practice. Epilepsia. 2004; 45(Suppl6):13-8.10.1111/j.0013-9580.2004.455003.x15315511]Search in Google Scholar
[13. Buvanendran A, Kroin JS, Kari M, Tuman KJ. Can a single dose of 300 mg of pregabalin reach acute antihyperalgesic levels in the central nervous system? Reg Anesth Pain Med. 2010; 35:535-8.]Search in Google Scholar
[14. Buvanendran A, Kroin JS, Della Valle CJ, Moric M, Tuman KJ. Cerebrospinal fluid neurotransmitter changes during the perioperative period in patients undergoing total knee replacement: a randomized trial. Anesth Analg. 2012; 114:434-41.10.1213/ANE.0b013e31823dc5fb22156332]Open DOISearch in Google Scholar
[15. McQuay HJ, Poon KH, Derry S, Moore RA. Acute pain: combination treatments and how we measure their efficacy. Br J Anaesth. 2008; 101:69-76. 10.1093/bja/aen10818503059]Open DOISearch in Google Scholar