Nurgül Dolu1, Levent Şahin2, Davut Sinan Kaplan3, Tuncer Demir3, Hasan Şimşek4, Mehrican Şahin5, Beyhan Cengiz6. 1. Department of Anesthesiology, Pazarcık State Hospital, Kahramanmaraş, Turkey. 2. Department of Anesthesiology, Faculty of Medicine, Gaziantep University, Gaziantep, Turkey. 3. Department of Physiology, Faculty of Medicine, Gaziantep University, Gaziantep, Turkey. 4. Department of Physiology, Faculty of Medicine, Dumlupınar University, Kütahya, Turkey. 5. Department of Anesthesiology, Dünya Göz Hospital, Gaziantep, Turkey. 6. Department of Medical Genetics, Faculty of Medicine, Gazi University, Ankara, Turkey.
Abstract
BACKGROUND/AIM: The objective of this experimental study was to examine the effects of epinephrine, dexmedetomidine, and clonidine added as adjuvants to bupivacaine on block onset and effect times, as well as the effects on the Na+ and Ca+2 channel gene expressions, which may indicate cell damage in the sciatic nerve cell membrane. MATERIALS AND METHODS: Rats were divided into five groups: Group S (sham), saline solution; Group B, bupivacaine; Group BD, bupivacaine + dexmedetomidine; Group BC, bupivacaine + clonidine; and Group BE, bupivacaine + epinephrine. For each group, 0.2 mL of local anesthetic was injected into the sciatic nerve bifurcation point of the right leg. Sensory (proprioceptive and nociceptive block) and motor block onset and ending times were recorded. RESULTS: The shortest onset time for the examined sciatic block was observed in the BC group, whereas the longest sensory and motor block times were observed in the BD group. The present data suggest suppressed TRPM7 and increased TRPM2 in the groups other than the BE group. CONCLUSION: Clonidine is more suitable for fast onset of peripheral nerve blocks, whereas the addition of dexmedetomidine is better in terms of duration. Because the SCN9A and TRPM2,4,7 expression ratios of the BE group showed the least amount of change, this group had the best cellular integrity.
BACKGROUND/AIM: The objective of this experimental study was to examine the effects of epinephrine, dexmedetomidine, and clonidine added as adjuvants to bupivacaine on block onset and effect times, as well as the effects on the Na+ and Ca+2 channel gene expressions, which may indicate cell damage in the sciatic nerve cell membrane. MATERIALS AND METHODS:Rats were divided into five groups: Group S (sham), saline solution; Group B, bupivacaine; Group BD, bupivacaine + dexmedetomidine; Group BC, bupivacaine + clonidine; and Group BE, bupivacaine + epinephrine. For each group, 0.2 mL of local anesthetic was injected into the sciatic nerve bifurcation point of the right leg. Sensory (proprioceptive and nociceptive block) and motor block onset and ending times were recorded. RESULTS: The shortest onset time for the examined sciatic block was observed in the BC group, whereas the longest sensory and motor block times were observed in the BD group. The present data suggest suppressed TRPM7 and increased TRPM2 in the groups other than the BE group. CONCLUSION:Clonidine is more suitable for fast onset of peripheral nerve blocks, whereas the addition of dexmedetomidine is better in terms of duration. Because the SCN9A and TRPM2,4,7 expression ratios of the BE group showed the least amount of change, this group had the best cellular integrity.
Entities:
Keywords:
Sciatic nerve block; TRPM; bupivacaine; rat
Authors: Ivan Urits; Celina Guadalupe Virgen; Hamed Alattar; Jai Won Jung; Amnon A Berger; Hisham Kassem; Islam Mohammad Shehata; Amir Elhassan; Alan D Kaye; Omar Viswanath Journal: Psychopharmacol Bull Date: 2020-10-15