• Masafumi Takada, Makoto Fukusaki, Yoshiaki Terao, Masato Kanaide, Kazunori Yamashita, Shuhei Matsumoto, and Koji Sumikawa.
• Department of Anesthesia, Nagasaki Rosai Hospital, 2-12-5 Setogoshi, Sasebo 857-0134, Japan.
• J Anesth. 2005 Jan 1;19(2):180-2.

AbstractWe evaluated whether preadministration of low-dose ketamine could attenuate tourniquet pain and arterial pressure increase using high tourniquet pressure in ten healthy awake volunteers. Ketamine, 0.1 mg x kg(-1), or normal saline was given intravenously in a double-blind fashion before tourniquet inflation with a pressure of 400 mmHg at the thigh. Visual analog scale (VAS) scores and systolic blood pressure (SBP) were measured at 5-min intervals. Ketamine significantly reduced VAS scores compared to saline just after tourniquet inflation [90 (64-100) mm, median (range), with saline versus 66 (50-81) mm with ketamine, P < 0.01] and at 30 min [92 (61-100) mm with saline versus 70 (50-100) mm with ketamine, P < 0.03), and significantly prolonged tourniquet time (28 +/- 6 min with saline, mean +/- SD, versus 37 +/- 7 min with ketamine, P < 0.01). SBP (120 +/- 9 mmHg) significantly increased before tourniquet deflation (133 +/- 16 mmHg) in the saline trial, but not in the ketamine trial. The results show that preadministration of low-dose ketamine attenuates tourniquet pain and arterial pressure increase during high-pressure tourniquet application and prolongs tourniquet time in healthy volunteers.

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