• Jong-Taek Park, Jae-Chan Choi, Young-Soo Yoo, Young-Bok Lee, Soon-Yul Kim, and Hyun-Kyo Lim.
• Department of Anesthesiology and Pain Medicine, Yonsei University Wonju College of Medicine, 162 Ilsan-dong, Wonju, Gangwon-do 220-701, Korea.
• Yonsei Med. J. 2005 Dec 31;46(6):765-8.

AbstractWe examined whether pretreatment with a small dose of thiopental was effective in reducing pain induced by the intravenous injection of rocuronium. Withdrawal movement was used to assess pain reduction. Ninety patients were randomly assigned to one of two groups: patients in the control group were pretreated with 2 mL saline, and those in the thiopental group were pretreated with 2 mL (50 mg) thiopental. Thiopental 5 mg/kg was injected intravenously. After a loss of consciousness, the upper arm was compressed with a rubber tourniquet, and the pretreatment drugs were administered. Thirty seconds later the tourniquet was removed and 0.6 mg/kg rocuronium was administered. Withdrawal movement was assessed using a four-grade scale: no movement, movement limited to the wrist, to the elbow or to the shoulder. The frequency of withdrawal movement in the group pretreated with thiopental was lower than in the control group (34 vs. 13, p < 0.05). We concluded that pretreatment with 2 mL (50 mg) thiopental is effective in reducing pain caused by the intravenous injection of rocuronium.

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