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The Analgesic Effect of Midazolam When Added to Lidocaine for Intravenous Regional Anaesthesia



Kashefi P1 ; Montazeri K1 ; Honarmand A1 ; Safavi M1 ; Hosseini HM2
Authors
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Authors Affiliations
  1. 1. Department of Anesthesia, Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Journal of Research in Medical Sciences Published:2011

Abstract

BACKGROUND: Midazolam has analgesic properties. The aim of the present study was to assess the analgesic effect of midazolam when added to lidocaine in intravenous regional anesthesia (IVRA). METHODS: Sixty patients undergoing hand surgery were randomly allocated into two groups to receive 3 mg/kg 2% lidocaine diluted with saline to a total volume of 40 mL in the control group (group lidocaine saline ~ LS, n=30) or 50 μg/kg midazolam plus 3 mg/kg 2% lidocaine diluted with saline to a total volume of 40 mL in the midazolam group (group lidocaine midazolam ~ LM, n=30). Before and after the tourniquet application, hemodynamic variables, tourniquet pain, sedation, and analgesic use were recorded. RESULTS: Shortened sensory and motor block onset time [4.20 (0.84) vs. 5.94 (0.83) min, p = 0.001 and 6.99 (0.72) vs. 9.07 (0.99) min, p = 0.001 in LM and LS groups, respectively], prolonged sensory and motor block recovery times [8.41 (0.94) vs. 5.68 (0.90) min, p = 0.001 and 11.85 (1.18) vs. 7.06 (0.82) min, p = 0.001 in LM and LS groups, respectively], shortened visual analog scale (VAS) scores of tourniquet pain (p < 0.05), and improved quality of anesthesia were found in group LM (p < 0.05). VAS scores were lower in group LM in the postoperative period (p = 0.001). Postoperative analgesic requirements were significantly smaller in group LM (p = 0.001). CONCLUSIONS: The addition of 50 μg/kg midazolam to lidocaine for IVRA shortens the onset of sensory and motor block, and improves quality of anesthesia and perioperative analgesia without causing side effects.
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